Номер 91, страница 194 - гдз по геометрии 10 класс учебник Мерзляк, Номировский
Авторы: Мерзляк А. Г., Номировский Д. А., Полонский В. Б., Якир М. С.
Тип: Учебник
Издательство: Просвещение, Вентана-граф
Год издания: 2017 - 2026
Уровень обучения: базовый
Цвет обложки: оранжевый
ISBN: 978-5-360-07142-6
Математика: алгебра и начала математического анализа, геометрия
Популярные ГДЗ в 10 классе
Упражнения для повторения курса геометрии. Параграф 20. Упражнения для повторения курса геометрии 10 класса - номер 91, страница 194.
App\Models\Task {#1030 // resources/views/models/task/default.blade.php #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 733568 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "194" "field_page_end" => null "field_url" => "/10-klass/geometrija/merzlyak-uchebnik/20-91" "field_display_title" => "91" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1037 #items: array:1 [ 0 => App\Models\Term {#1036 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 26 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #original: array:6 [ "id" => 26 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1035 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1046 #items: array:1 [ 0 => App\Models\Branch {#1045 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 732734 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Упражнения для повторения курса геометрии" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1047 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "185" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1083 #items: array:1 [ 0 => App\Models\Book {#1048 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 1851 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1050 #items: array:1 [ 0 => App\Models\Term {#1049 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:10 [ "id" => 6477 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Геометрия" "field_abbreviated_name" => null "field_cases" => array:6 [ …6] "field_foreign_lang_name" => null "field_short_name" => null "field_subject_type" => "technical_subject" "field_translit" => "geometrija" ] #original: array:10 [ "id" => 6477 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Геометрия" "field_abbreviated_name" => null "field_cases" => array:6 [ …6] "field_foreign_lang_name" => null "field_short_name" => null "field_subject_type" => "technical_subject" "field_translit" => "geometrija" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_class" => Illuminate\Database\Eloquent\Collection {#1051 #items: array:1 [ 0 => App\Models\Term {#1052 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5459 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "10" "field_cases" => array:6 [ …6] "field_translit" => "desjatyj" ] #original: array:6 [ "id" => 5459 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "10" "field_cases" => array:6 [ …6] "field_translit" => "desjatyj" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_publisher" => Illuminate\Database\Eloquent\Collection {#1053 #items: array:2 [ 0 => App\Models\Term {#1054 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #original: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Term {#1055 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5174 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Вентана-граф" "field_cases" => null "field_translit" => "ventana-graf" ] #original: array:6 [ "id" => 5174 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Вентана-граф" "field_cases" => null "field_translit" => "ventana-graf" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_author" => Illuminate\Database\Eloquent\Collection {#1056 #items: array:4 [ 0 => App\Models\Term {#1057 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 5164 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Мерзляк" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Аркадий" "field_patronymic" => "Григорьевич" "field_surname_rp" => null ] #original: array:12 [ "id" => 5164 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Мерзляк" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Аркадий" "field_patronymic" => "Григорьевич" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Term {#1058 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 5370 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Номировский" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Дмитрий" "field_patronymic" => "Анатольевич" "field_surname_rp" => null ] #original: array:12 [ "id" => 5370 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Номировский" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Дмитрий" "field_patronymic" => "Анатольевич" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Term {#1059 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 5506 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Полонский" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Виталий" "field_patronymic" => "Борисович" "field_surname_rp" => null ] #original: array:12 [ "id" => 5506 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Полонский" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Виталий" "field_patronymic" => "Борисович" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 3 => App\Models\Term {#1060 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 6445 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Якир" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Михаил" "field_patronymic" => "Семёнович" "field_surname_rp" => null ] #original: array:12 [ "id" => 6445 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Якир" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Михаил" "field_patronymic" => "Семёнович" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1061 #items: [] #escapeWhenCastingToString: false } "field_book_type" => Illuminate\Database\Eloquent\Collection {#1062 #items: array:1 [ 0 => App\Models\Term {#1063 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:10 [ "id" => 6671 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Учебник" "field_book_type_foreign" => null "field_cases" => array:6 [ …6] "field_plural_form" => null "field_short_name" => null "field_short_name_foreign" => null "field_translit" => "uchebnik" ] #original: array:10 [ "id" => 6671 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Учебник" "field_book_type_foreign" => null "field_cases" => array:6 [ …6] "field_plural_form" => null "field_short_name" => null "field_short_name_foreign" => null "field_translit" => "uchebnik" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_country" => Illuminate\Database\Eloquent\Collection {#1064 #items: array:1 [ 0 => App\Models\Term {#1065 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 9 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Россия" "field_cases" => array:6 [ …6] "field_translit" => "rossiya" ] #original: array:6 [ "id" => 9 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Россия" "field_cases" => array:6 [ …6] "field_translit" => "rossiya" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1066 #items: array:1 [ 0 => App\Models\Term {#1067 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 15 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Москва" "field_cases" => array:6 [ …6] "field_translit" => "moskva" ] #original: array:6 [ "id" => 15 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Москва" "field_cases" => array:6 [ …6] "field_translit" => "moskva" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1068 #items: [] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1069 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1070 #items: array:1 [ 0 => App\Models\Term {#1071 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 38 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "базовый" "field_cases" => array:6 [ …6] "field_translit" => "bazovyy" ] #original: array:6 [ "id" => 38 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "базовый" "field_cases" => array:6 [ …6] "field_translit" => "bazovyy" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1072 #items: array:1 [ 0 => App\Models\Term {#1073 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:10 [ "id" => 6706 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "ФГОС (старый)" "field_cases" => array:6 [ …6] "field_color" => null "field_end_year" => "2022" "field_start_year" => "2019" "field_translit" => "fgos-old" "field_type" => null ] #original: array:10 [ "id" => 6706 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "ФГОС (старый)" "field_cases" => array:6 [ …6] "field_color" => null "field_end_year" => "2022" "field_start_year" => "2019" "field_translit" => "fgos-old" "field_type" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1074 #items: [] #escapeWhenCastingToString: false } "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1075 #items: [] #escapeWhenCastingToString: false } "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2017" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебное пособие" "field_allowed" => null "field_reserve_field" => "Математика: алгебра и 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"field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1125} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1126} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Branch {#1127 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 732735 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Упражнения для повторения курса геометрии 10 класса" "field_branch_order" => "20" "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1131 #items: array:1 [ 0 => App\Models\Term {#1128 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 32 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Параграф" "field_cases" => array:6 [ …6] "field_page_check_not_needed" => null "field_short_name" => "§" ] #original: array:7 [ "id" => 32 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Параграф" "field_cases" => array:6 [ …6] "field_page_check_not_needed" => null "field_short_name" => "§" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_page_start" => "185" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1130 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1129 #items: array:1 [ 0 => App\Models\Branch {#1045} ] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 732735 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Упражнения для повторения курса геометрии 10 класса" "field_branch_order" => "20" "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1131} "field_page_start" => "185" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1130} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1129} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1112 #items: array:3 [ 0 => App\Models\Element {#1105 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 931998 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1095 #items: array:1 [ 0 => App\Models\Edition {#1103 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 2217 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1101 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "margarita" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1102 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1100 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1099 …2} "field_content_source" => null ] #original: array:21 [ "id" => 2217 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1101 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "margarita" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1102 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1100 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1099 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "733568" "type" => "task" ] "text" => "<p><strong>20.91.</strong> Ромб $ABCD$ является основанием пирамиды $MABCD$, $AB = 10$ см, $\angle BAD = 60^{\circ}$. Плоскости $ABM$ и $ADM$ перпендикулярны плоскости основания пирамиды, а плоскости $BCM$ и $DCM$ образуют с плоскостью основания углы по $60^{\circ}$. Найдите площадь боковой поверхности пирамиды.</p>" "img" => array:1 [ 0 => array:5 [ "name" => "91-1.png" "alt" => null "width" => "507" "height" => 128 "path" => "/media/geometrija_10/merzljak/0-20/91-1.webp?ts=1739301707" ] ] ] #original: array:7 [ "id" => 931998 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1095} "task" => array:2 [ "refs" => "733568" "type" => "task" ] "text" => "<p><strong>20.91.</strong> Ромб $ABCD$ является основанием пирамиды $MABCD$, $AB = 10$ см, $\angle BAD = 60^{\circ}$. Плоскости $ABM$ и $ADM$ перпендикулярны плоскости основания пирамиды, а плоскости $BCM$ и $DCM$ образуют с плоскостью основания углы по $60^{\circ}$. Найдите площадь боковой поверхности пирамиды.</p>" "img" => array:1 [ 0 => array:5 [ "name" => "91-1.png" "alt" => null "width" => "507" "height" => 128 "path" => "/media/geometrija_10/merzljak/0-20/91-1.webp?ts=1739301707" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1097 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 932831 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1089 #items: array:1 [ 0 => App\Models\Edition {#1098 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 2218 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 1" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1093 …2} "field_content_type" => "free" "field_content_mode" => "image" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Неизвестный" "field_moderator" => "margarita" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1094 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1092 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1087 …2} "field_content_source" => null ] #original: array:21 [ "id" => 2218 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 1" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1093 …2} "field_content_type" => "free" "field_content_mode" => "image" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Неизвестный" "field_moderator" => "margarita" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1094 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1092 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1087 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "733568" "type" => "task" ] "img" => array:1 [ 0 => array:5 [ "name" => "91-1.png" "alt" => null "width" => "694" "height" => 3405 "path" => "/media/geometrija_10/merzljak/1-20/91-1.webp?ts=1739302614" ] ] ] #original: array:6 [ "id" => 932831 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1089} "task" => array:2 [ "refs" => "733568" "type" => "task" ] "img" => array:1 [ 0 => array:5 [ "name" => "91-1.png" "alt" => null "width" => "694" "height" => 3405 "path" => "/media/geometrija_10/merzljak/1-20/91-1.webp?ts=1739302614" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Element {#1091 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1445867 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1043 #items: array:1 [ 0 => App\Models\Edition {#1090 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 5367 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 3" "field_order" => "4" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1084 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "vadim" "field_edition_type" => "solution" "field_root_dir" => "3-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1086 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1085 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1041 …2} "field_content_source" => null ] #original: array:21 [ "id" => 5367 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 3" "field_order" => "4" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1084 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "vadim" "field_edition_type" => "solution" "field_root_dir" => "3-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1086 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1085 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1041 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "733568" "type" => "task" ] "text" => "<p>Поскольку плоскости $ABM$ и $ADM$ перпендикулярны плоскости основания $ABCD$, то их линия пересечения, ребро $AM$, также перпендикулярна плоскости основания. Следовательно, $AM$ — высота пирамиды, а грани $ABM$ и $ADM$ являются прямоугольными треугольниками с прямым углом $A$.</p><p>Основание пирамиды — ромб $ABCD$ со стороной $a = 10$ см и углом $\angle BAD = 60^{\circ}$. Смежный угол ромба $\angle ABC = 180^{\circ} - 60^{\circ} = 120^{\circ}$.</p><p>По условию, плоскости $BCM$ и $DCM$ образуют с плоскостью основания углы по $60^{\circ}$. Угол между плоскостью боковой грани и плоскостью основания — это линейный угол соответствующего двугранного угла. Построим его для грани $BCM$. Проведём из точки $A$ перпендикуляр $AK$ к стороне $BC$ в плоскости основания. Так как $AM \perp (ABC)$, то $AM$ — перпендикуляр, а $AK$ — проекция наклонной $MK$ на плоскость основания. Поскольку проекция $AK$ перпендикулярна прямой $BC$, то по теореме о трёх перпендикулярах и сама наклонная $MK$ перпендикулярна $BC$. Таким образом, $MK$ является высотой (апофемой) грани $BCM$, а угол $\angle MKA$ — это линейный угол двугранного угла между плоскостью $BCM$ и плоскостью основания. По условию, $\angle MKA = 60^{\circ}$.</p><p>Найдём длину высоты $AK$. Рассмотрим треугольник $ABC$. Его площадь можно вычислить двумя способами: 1. $S_{\triangle ABC} = \frac{1}{2} AB \cdot BC \cdot \sin(\angle ABC) = \frac{1}{2} \cdot 10 \cdot 10 \cdot \sin(120^{\circ}) = 50 \cdot \frac{\sqrt{3}}{2} = 25\sqrt{3}$ см$^2$. 2. $S_{\triangle ABC} = \frac{1}{2} BC \cdot AK = \frac{1}{2} \cdot 10 \cdot AK = 5 \cdot AK$. Приравнивая два выражения для площади, получаем: $5 \cdot AK = 25\sqrt{3}$, откуда $AK = 5\sqrt{3}$ см.</p><p>Теперь из прямоугольного треугольника $AMK$ (где $\angle MAK = 90^{\circ}$) найдём высоту пирамиды $AM$: $\tan(\angle MKA) = \frac{AM}{AK} \implies AM = AK \cdot \tan(60^{\circ}) = 5\sqrt{3} \cdot \sqrt{3} = 15$ см.</p><p>Площадь боковой поверхности $S_{бок}$ равна сумме площадей её четырёх боковых граней: $S_{бок} = S_{\triangle ABM} + S_{\triangle ADM} + S_{\triangle BCM} + S_{\triangle DCM}$.</p><p>1. Найдём площади прямоугольных треугольников $ABM$ и $ADM$: $S_{\triangle ABM} = \frac{1}{2} AB \cdot AM = \frac{1}{2} \cdot 10 \cdot 15 = 75$ см$^2$. Поскольку ромб имеет равные стороны $AD = AB = 10$ см, то $S_{\triangle ADM} = \frac{1}{2} AD \cdot AM = \frac{1}{2} \cdot 10 \cdot 15 = 75$ см$^2$.</p><p>2. Найдём площади треугольников $BCM$ и $DCM$. Площадь треугольника $BCM$ равна $S_{\triangle BCM} = \frac{1}{2} BC \cdot MK$. Найдём апофему $MK$ из прямоугольного треугольника $AMK$: $\cos(\angle MKA) = \frac{AK}{MK} \implies MK = \frac{AK}{\cos(60^{\circ})} = \frac{5\sqrt{3}}{1/2} = 10\sqrt{3}$ см. Тогда $S_{\triangle BCM} = \frac{1}{2} \cdot 10 \cdot 10\sqrt{3} = 50\sqrt{3}$ см$^2$.</p><p>В силу симметрии ромба относительно диагонали $AC$, треугольники $ABC$ и $ADC$ равны. Следовательно, высота из $A$ к стороне $CD$ также равна $5\sqrt{3}$ см. Поскольку угол между гранью $DCM$ и основанием также равен $60^{\circ}$, то треугольники $BCM$ и $DCM$ равны. Таким образом, их площади равны: $S_{\triangle DCM} = S_{\triangle BCM} = 50\sqrt{3}$ см$^2$.</p><p>3. Вычислим общую площадь боковой поверхности: $S_{бок} = S_{\triangle ABM} + S_{\triangle ADM} + S_{\triangle BCM} + S_{\triangle DCM} = 75 + 75 + 50\sqrt{3} + 50\sqrt{3} = 150 + 100\sqrt{3}$ см$^2$.</p><p>Ответ: $150 + 100\sqrt{3}$ см$^2$.</p>" ] #original: array:6 [ "id" => 1445867 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1043} "task" => array:2 [ "refs" => "733568" "type" => "task" ] "text" => "<p>Поскольку плоскости $ABM$ и $ADM$ перпендикулярны плоскости основания $ABCD$, то их линия пересечения, ребро $AM$, также перпендикулярна плоскости основания. Следовательно, $AM$ — высота пирамиды, а грани $ABM$ и $ADM$ являются прямоугольными треугольниками с прямым углом $A$.</p><p>Основание пирамиды — ромб $ABCD$ со стороной $a = 10$ см и углом $\angle BAD = 60^{\circ}$. Смежный угол ромба $\angle ABC = 180^{\circ} - 60^{\circ} = 120^{\circ}$.</p><p>По условию, плоскости $BCM$ и $DCM$ образуют с плоскостью основания углы по $60^{\circ}$. Угол между плоскостью боковой грани и плоскостью основания — это линейный угол соответствующего двугранного угла. Построим его для грани $BCM$. Проведём из точки $A$ перпендикуляр $AK$ к стороне $BC$ в плоскости основания. Так как $AM \perp (ABC)$, то $AM$ — перпендикуляр, а $AK$ — проекция наклонной $MK$ на плоскость основания. Поскольку проекция $AK$ перпендикулярна прямой $BC$, то по теореме о трёх перпендикулярах и сама наклонная $MK$ перпендикулярна $BC$. Таким образом, $MK$ является высотой (апофемой) грани $BCM$, а угол $\angle MKA$ — это линейный угол двугранного угла между плоскостью $BCM$ и плоскостью основания. По условию, $\angle MKA = 60^{\circ}$.</p><p>Найдём длину высоты $AK$. Рассмотрим треугольник $ABC$. Его площадь можно вычислить двумя способами: 1. $S_{\triangle ABC} = \frac{1}{2} AB \cdot BC \cdot \sin(\angle ABC) = \frac{1}{2} \cdot 10 \cdot 10 \cdot \sin(120^{\circ}) = 50 \cdot \frac{\sqrt{3}}{2} = 25\sqrt{3}$ см$^2$. 2. $S_{\triangle ABC} = \frac{1}{2} BC \cdot AK = \frac{1}{2} \cdot 10 \cdot AK = 5 \cdot AK$. Приравнивая два выражения для площади, получаем: $5 \cdot AK = 25\sqrt{3}$, откуда $AK = 5\sqrt{3}$ см.</p><p>Теперь из прямоугольного треугольника $AMK$ (где $\angle MAK = 90^{\circ}$) найдём высоту пирамиды $AM$: $\tan(\angle MKA) = \frac{AM}{AK} \implies AM = AK \cdot \tan(60^{\circ}) = 5\sqrt{3} \cdot \sqrt{3} = 15$ см.</p><p>Площадь боковой поверхности $S_{бок}$ равна сумме площадей её четырёх боковых граней: $S_{бок} = S_{\triangle ABM} + S_{\triangle ADM} + S_{\triangle BCM} + S_{\triangle DCM}$.</p><p>1. Найдём площади прямоугольных треугольников $ABM$ и $ADM$: $S_{\triangle ABM} = \frac{1}{2} AB \cdot AM = \frac{1}{2} \cdot 10 \cdot 15 = 75$ см$^2$. Поскольку ромб имеет равные стороны $AD = AB = 10$ см, то $S_{\triangle ADM} = \frac{1}{2} AD \cdot AM = \frac{1}{2} \cdot 10 \cdot 15 = 75$ см$^2$.</p><p>2. Найдём площади треугольников $BCM$ и $DCM$. Площадь треугольника $BCM$ равна $S_{\triangle BCM} = \frac{1}{2} BC \cdot MK$. Найдём апофему $MK$ из прямоугольного треугольника $AMK$: $\cos(\angle MKA) = \frac{AK}{MK} \implies MK = \frac{AK}{\cos(60^{\circ})} = \frac{5\sqrt{3}}{1/2} = 10\sqrt{3}$ см. Тогда $S_{\triangle BCM} = \frac{1}{2} \cdot 10 \cdot 10\sqrt{3} = 50\sqrt{3}$ см$^2$.</p><p>В силу симметрии ромба относительно диагонали $AC$, треугольники $ABC$ и $ADC$ равны. Следовательно, высота из $A$ к стороне $CD$ также равна $5\sqrt{3}$ см. Поскольку угол между гранью $DCM$ и основанием также равен $60^{\circ}$, то треугольники $BCM$ и $DCM$ равны. Таким образом, их площади равны: $S_{\triangle DCM} = S_{\triangle BCM} = 50\sqrt{3}$ см$^2$.</p><p>3. Вычислим общую площадь боковой поверхности: $S_{бок} = S_{\triangle ABM} + S_{\triangle ADM} + S_{\triangle BCM} + S_{\triangle DCM} = 75 + 75 + 50\sqrt{3} + 50\sqrt{3} = 150 + 100\sqrt{3}$ см$^2$.</p><p>Ответ: $150 + 100\sqrt{3}$ см$^2$.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => null "type" => "task" ] "previous" => array:2 [ "refs" => "733567" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1108 #items: array:1 [ 0 => App\Models\Book {#1048} ] #escapeWhenCastingToString: false } "page" => Illuminate\Database\Eloquent\Collection {#1111 #items: array:1 [ 0 => App\Models\BookPage {#1039 #connection: "mysql" #table: "book_pages" #primaryKey: "id" #keyType: 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#visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "971633" "type" => "book_page" ] "previous" => array:2 [ "refs" => "971631" "type" => "book_page" ] "tasks" => Illuminate\Database\Eloquent\Collection {#1208 #items: array:10 [ 0 => App\Models\Task {#1224 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 733559 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "193" "field_page_end" => "194" "field_url" => "/10-klass/geometrija/merzlyak-uchebnik/20-82" "field_display_title" => "82" "field_outside_task" => "0" "field_task_type" => Illuminate\Database\Eloquent\Collection {#1225 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null 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Illuminate\Database\Eloquent\Collection {#1278 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1280 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1276 …2} "content" => Illuminate\Database\Eloquent\Collection {#1275 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1293 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 733563 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "194" "field_page_end" => null "field_url" => "/10-klass/geometrija/merzlyak-uchebnik/20-86" "field_display_title" => "86" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1260 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection 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№91 (с. 194)
Условие. №91 (с. 194)
скриншот условия
20.91. Ромб $ABCD$ является основанием пирамиды $MABCD$, $AB = 10$ см, $\angle BAD = 60^{\circ}$. Плоскости $ABM$ и $ADM$ перпендикулярны плоскости основания пирамиды, а плоскости $BCM$ и $DCM$ образуют с плоскостью основания углы по $60^{\circ}$. Найдите площадь боковой поверхности пирамиды.
Решение 3. №91 (с. 194)
Поскольку плоскости $ABM$ и $ADM$ перпендикулярны плоскости основания $ABCD$, то их линия пересечения, ребро $AM$, также перпендикулярна плоскости основания. Следовательно, $AM$ — высота пирамиды, а грани $ABM$ и $ADM$ являются прямоугольными треугольниками с прямым углом $A$.
Основание пирамиды — ромб $ABCD$ со стороной $a = 10$ см и углом $\angle BAD = 60^{\circ}$. Смежный угол ромба $\angle ABC = 180^{\circ} - 60^{\circ} = 120^{\circ}$.
По условию, плоскости $BCM$ и $DCM$ образуют с плоскостью основания углы по $60^{\circ}$. Угол между плоскостью боковой грани и плоскостью основания — это линейный угол соответствующего двугранного угла. Построим его для грани $BCM$. Проведём из точки $A$ перпендикуляр $AK$ к стороне $BC$ в плоскости основания. Так как $AM \perp (ABC)$, то $AM$ — перпендикуляр, а $AK$ — проекция наклонной $MK$ на плоскость основания. Поскольку проекция $AK$ перпендикулярна прямой $BC$, то по теореме о трёх перпендикулярах и сама наклонная $MK$ перпендикулярна $BC$. Таким образом, $MK$ является высотой (апофемой) грани $BCM$, а угол $\angle MKA$ — это линейный угол двугранного угла между плоскостью $BCM$ и плоскостью основания. По условию, $\angle MKA = 60^{\circ}$.
Найдём длину высоты $AK$. Рассмотрим треугольник $ABC$. Его площадь можно вычислить двумя способами: 1. $S_{\triangle ABC} = \frac{1}{2} AB \cdot BC \cdot \sin(\angle ABC) = \frac{1}{2} \cdot 10 \cdot 10 \cdot \sin(120^{\circ}) = 50 \cdot \frac{\sqrt{3}}{2} = 25\sqrt{3}$ см$^2$. 2. $S_{\triangle ABC} = \frac{1}{2} BC \cdot AK = \frac{1}{2} \cdot 10 \cdot AK = 5 \cdot AK$. Приравнивая два выражения для площади, получаем: $5 \cdot AK = 25\sqrt{3}$, откуда $AK = 5\sqrt{3}$ см.
Теперь из прямоугольного треугольника $AMK$ (где $\angle MAK = 90^{\circ}$) найдём высоту пирамиды $AM$: $\tan(\angle MKA) = \frac{AM}{AK} \implies AM = AK \cdot \tan(60^{\circ}) = 5\sqrt{3} \cdot \sqrt{3} = 15$ см.
Площадь боковой поверхности $S_{бок}$ равна сумме площадей её четырёх боковых граней: $S_{бок} = S_{\triangle ABM} + S_{\triangle ADM} + S_{\triangle BCM} + S_{\triangle DCM}$.
1. Найдём площади прямоугольных треугольников $ABM$ и $ADM$: $S_{\triangle ABM} = \frac{1}{2} AB \cdot AM = \frac{1}{2} \cdot 10 \cdot 15 = 75$ см$^2$. Поскольку ромб имеет равные стороны $AD = AB = 10$ см, то $S_{\triangle ADM} = \frac{1}{2} AD \cdot AM = \frac{1}{2} \cdot 10 \cdot 15 = 75$ см$^2$.
2. Найдём площади треугольников $BCM$ и $DCM$. Площадь треугольника $BCM$ равна $S_{\triangle BCM} = \frac{1}{2} BC \cdot MK$. Найдём апофему $MK$ из прямоугольного треугольника $AMK$: $\cos(\angle MKA) = \frac{AK}{MK} \implies MK = \frac{AK}{\cos(60^{\circ})} = \frac{5\sqrt{3}}{1/2} = 10\sqrt{3}$ см. Тогда $S_{\triangle BCM} = \frac{1}{2} \cdot 10 \cdot 10\sqrt{3} = 50\sqrt{3}$ см$^2$.
В силу симметрии ромба относительно диагонали $AC$, треугольники $ABC$ и $ADC$ равны. Следовательно, высота из $A$ к стороне $CD$ также равна $5\sqrt{3}$ см. Поскольку угол между гранью $DCM$ и основанием также равен $60^{\circ}$, то треугольники $BCM$ и $DCM$ равны. Таким образом, их площади равны: $S_{\triangle DCM} = S_{\triangle BCM} = 50\sqrt{3}$ см$^2$.
3. Вычислим общую площадь боковой поверхности: $S_{бок} = S_{\triangle ABM} + S_{\triangle ADM} + S_{\triangle BCM} + S_{\triangle DCM} = 75 + 75 + 50\sqrt{3} + 50\sqrt{3} = 150 + 100\sqrt{3}$ см$^2$.
Ответ: $150 + 100\sqrt{3}$ см$^2$.
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