Номер 474, страница 131 - гдз по геометрии 10-11 класс учебник Атанасян, Бутузов

Геометрия, 10-11 класс Учебник, авторы: Атанасян Левон Сергеевич, Бутузов Валентин Фёдорович, Кадомцев Сергей Борисович, Позняк Эдуард Генрихович, Киселёва Людмила Сергеевна, издательство Просвещение, Москва, 2019, коричневого цвета

Авторы: Атанасян Л. С., Бутузов В. Ф., Кадомцев С. Б., Позняк Э. Г., Киселёва Л. С.

Тип: Учебник

Издательство: Просвещение

Год издания: 2019 - 2026

Уровень обучения: базовый и углублённый

Цвет обложки: коричневый с ромбами

ISBN: 978-5-09-103606-0 (2023)

Допущено Министерством просвещения Российской Федерации

Математика: алгебра и начала математического анализа, геометрия

Глава 5. Объёмы тел. Параграф 3. Объёмы наклонной призмы, пирамиды и конуса - номер 474, страница 131.

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                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                        1 => App\Models\Term {#1136
                          #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" => 5460
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "11"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "odinadcatyj"
                          ]
                          #original: array:6 [
                            "id" => 5460
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "11"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "odinadcatyj"
                          ]
                          #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 {#1137
                      #items: array:1 [
                        0 => App\Models\Term {#1138
                          #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 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1139
                      #items: array:5 [
                        0 => App\Models\Term {#1140
                          #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" => 3753
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Атанасян"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Левон"
                            "field_patronymic" => "Сергеевич"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 3753
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Атанасян"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Левон"
                            "field_patronymic" => "Сергеевич"
                            "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 {#1141
                          #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" => 3949
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Бутузов"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Валентин"
                            "field_patronymic" => "Фёдорович"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 3949
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Бутузов"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Валентин"
                            "field_patronymic" => "Фёдорович"
                            "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 {#1142
                          #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" => 4518
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Кадомцев"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Сергей"
                            "field_patronymic" => "Борисович"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 4518
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Кадомцев"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Сергей"
                            "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 {#1143
                          #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" => 5494
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Позняк"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Эдуард"
                            "field_patronymic" => "Генрихович"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 5494
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Позняк"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Эдуард"
                            "field_patronymic" => "Генрихович"
                            "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 => "*"
                          ]
                        }
                        4 => App\Models\Term {#1144
                          #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" => 6905
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Киселёва"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Людмила"
                            "field_patronymic" => "Сергеевна"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 6905
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Киселёва"
                             …8
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1145
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1146
                      #items: array:1 [
                        0 => App\Models\Term {#1147
                          #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 [ …10]
                          #original: array:10 [ …10]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1148
                      #items: array:1 [
                        0 => App\Models\Term {#1149
                          #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 [ …6]
                          #original: array:6 [ …6]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1150
                      #items: array:1 [
                        0 => App\Models\Term {#1151
                          #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 [ …6]
                          #original: array:6 [ …6]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1152
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1153
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1154
                      #items: array:1 [
                        0 => App\Models\Term {#1155
                          #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 [ …6]
                          #original: array:6 [ …6]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1156
                      #items: array:1 [
                        0 => App\Models\Term {#1157
                          #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 [ …10]
                          #original: array:10 [ …10]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_publication_number" => "11"
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1158
                      #items: array:1 [
                        0 => App\Models\Term {#1159
                          #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 [ …6]
                          #original: array:6 [ …6]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1160
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition_degree" => null
                    "field_cover_description" => "с ромбами"
                    "field_publication_year" => "2019"
                    "field_publication_year_until" => null
                    "field_part" => ""
                    "field_part_writing" => ""
                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для общеобразовательных организаций"
                    "field_allowed" => "Допущено Министерством просвещения Российской Федерации"
                    "field_reserve_field" => "Математика: алгебра и начала математического анализа, геометрия"
                    "field_link_to_source" => null
                    "field_tasks_count" => "1147"
                    "field_priority" => "12"
                    "field_default_folder" => "/geometrija_10/atanasjan-u23/"
                    "field_isbn" => "978-5-09-103606-0 (2023)"
                    "field_cover" => array:1 [
                      0 => "/media/geometrija_10/atanasjan-u23/covers/cover1.webp?ts=1739363242"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
                    "field_covers" => array:1 [
                      0 => array:4 [
                        "path" => "/media/geometrija_10/atanasjan-u23/covers/cover1.webp?ts=1739363242"
                        "alt" => ""
                        "width" => "1200"
                        "height" => "1661"
                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1161
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1162
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1163
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_url" => "/10-klass/geometrija/atanasjan-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1164
                      #items: array:1 [
                        0 => App\Models\Term {#1165
                          #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 [ …6]
                          #original: array:6 [ …6]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "breadcrumbs" => array:3 [
                      "class" => 381
                      "subject" => 543
                      "class_subject" => 392
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1133}
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                    "field_for_whom" => "Учебник для общеобразовательных организаций"
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                    "field_reserve_field" => "Математика: алгебра и начала математического анализа, геометрия"
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                    "field_url" => "/10-klass/geometrija/atanasjan-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1164}
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1166
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            "id" => 744392
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            "field_display_title" => "Объёмы тел"
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        1 => App\Models\Branch {#1167
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                0 => App\Models\Term {#1169
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    "content" => Illuminate\Database\Eloquent\Collection {#1077
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            "task" => array:2 [
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            "text" => "<p> <b>474.</b> Все грани параллелепипеда — равные ромбы, диагонали которых равны 6 см и 8 см. Найдите объём параллелепипеда. </p>"
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            "task" => array:2 [
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                0 => App\Models\Edition {#1094
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                    "created_at" => "2026-04-10 13:58:26"
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        2 => App\Models\Element {#1101
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                0 => App\Models\Edition {#1102
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                    "created_at" => "2026-04-10 13:58:26"
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            "text" => "<p>Поскольку все грани параллелепипеда — равные ромбы, такой многогранник называется ромбоэдром. Все его ребра равны между собой. Найдем сначала характеристики одной грани (ромба).</p><p>Пусть диагонали ромба равны $d_1 = 6$ см и $d_2 = 8$ см. Диагонали ромба пересекаются под прямым углом и делятся точкой пересечения пополам. Сторону ромба $a$ можно найти по теореме Пифагора из прямоугольного треугольника, катетами которого являются половины диагоналей:</p><p>$a = \sqrt{(d_1/2)^2 + (d_2/2)^2} = \sqrt{(6/2)^2 + (8/2)^2} = \sqrt{3^2 + 4^2} = \sqrt{9 + 16} = \sqrt{25} = 5$ см.</p><p>Таким образом, все ребра параллелепипеда равны $a = 5$ см.</p><p>Площадь ромба (которая будет площадью основания $S_{осн}$) равна половине произведения его диагоналей:</p><p>$S_{осн} = \frac{1}{2} d_1 d_2 = \frac{1}{2} \cdot 6 \cdot 8 = 24$ см<sup>2</sup>.</p><p>Объем параллелепипеда вычисляется по формуле $V = S_{осн} \cdot H$, где $H$ — высота. Высота зависит от того, как ромбы соединены в пространстве, то есть от величины плоских углов при вершинах параллелепипеда. У ромба есть два острых и два тупых угла (если это не квадрат).</p><p>Найдем косинус острого угла $\alpha$ ромба. По теореме косинусов для треугольника, образованного двумя сторонами ромба $a$ и меньшей диагональю $d_1$:</p><p>$d_1^2 = a^2 + a^2 - 2a^2 \cos \alpha$</p><p>$6^2 = 5^2 + 5^2 - 2 \cdot 5^2 \cos \alpha$</p><p>$36 = 50 - 50 \cos \alpha$</p><p>$50 \cos \alpha = 14$</p><p>$\cos \alpha = \frac{14}{50} = \frac{7}{25}$</p><p>Косинус тупого угла $\beta$ будет $\cos \beta = \cos(180^\circ - \alpha) = -\cos \alpha = -\frac{7}{25}$.</p><p>Поскольку в условии не указано, какие именно углы (острые или тупые) сходятся в вершинах параллелепипеда, существует два основных типа ромбоэдров, которые можно составить из данных ромбов.</p><strong>Случай 1: Острый ромбоэдр</strong><p>В этом случае в двух противоположных вершинах параллелепипеда сходятся три острых угла $\alpha$ ромбов. Объем такого ромбоэдра можно найти по формуле:</p><p>$V_1 = a^3 \sqrt{1 - 3\cos^2\alpha + 2\cos^3\alpha}$</p><p>Подставим наши значения $a=5$ и $\cos\alpha = 7/25$:</p><p>$V_1 = 5^3 \sqrt{1 - 3\left(\frac{7}{25}\right)^2 + 2\left(\frac{7}{25}\right)^3} = 125 \sqrt{1 - 3\frac{49}{625} + 2\frac{343}{15625}}$</p><p>$V_1 = 125 \sqrt{\frac{15625 - 3 \cdot 49 \cdot 25 + 2 \cdot 343}{15625}} = 125 \frac{\sqrt{15625 - 3675 + 686}}{125}$</p><p>$V_1 = \sqrt{12636} = \sqrt{324 \cdot 39} = 18\sqrt{39}$ см<sup>3</sup>.</p><p><strong>Ответ:</strong> $18\sqrt{39}$ см<sup>3</sup>.</p><strong>Случай 2: Тупой ромбоэдр</strong><p>В этом случае в двух противоположных вершинах параллелепипеда сходятся три тупых угла $\beta$ ромбов. Формула для объема будет аналогичной, но с использованием $\cos\beta$:</p><p>$V_2 = a^3 \sqrt{1 - 3\cos^2\beta + 2\cos^3\beta}$</p><p>Подставим наши значения $a=5$ и $\cos\beta = -7/25$:</p><p>$V_2 = 5^3 \sqrt{1 - 3\left(-\frac{7}{25}\right)^2 + 2\left(-\frac{7}{25}\right)^3} = 125 \sqrt{1 - 3\frac{49}{625} - 2\frac{343}{15625}}$</p><p>$V_2 = 125 \sqrt{\frac{15625 - 3 \cdot 49 \cdot 25 - 2 \cdot 343}{15625}} = 125 \frac{\sqrt{15625 - 3675 - 686}}{125}$</p><p>$V_2 = \sqrt{11264} = \sqrt{1024 \cdot 11} = 32\sqrt{11}$ см<sup>3</sup>.</p><p><strong>Ответ:</strong> $32\sqrt{11}$ см<sup>3</sup>.</p>"
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            "text" => "<p>Поскольку все грани параллелепипеда — равные ромбы, такой многогранник называется ромбоэдром. Все его ребра равны между собой. Найдем сначала характеристики одной грани (ромба).</p><p>Пусть диагонали ромба равны $d_1 = 6$ см и $d_2 = 8$ см. Диагонали ромба пересекаются под прямым углом и делятся точкой пересечения пополам. Сторону ромба $a$ можно найти по теореме Пифагора из прямоугольного треугольника, катетами которого являются половины диагоналей:</p><p>$a = \sqrt{(d_1/2)^2 + (d_2/2)^2} = \sqrt{(6/2)^2 + (8/2)^2} = \sqrt{3^2 + 4^2} = \sqrt{9 + 16} = \sqrt{25} = 5$ см.</p><p>Таким образом, все ребра параллелепипеда равны $a = 5$ см.</p><p>Площадь ромба (которая будет площадью основания $S_{осн}$) равна половине произведения его диагоналей:</p><p>$S_{осн} = \frac{1}{2} d_1 d_2 = \frac{1}{2} \cdot 6 \cdot 8 = 24$ см<sup>2</sup>.</p><p>Объем параллелепипеда вычисляется по формуле $V = S_{осн} \cdot H$, где $H$ — высота. Высота зависит от того, как ромбы соединены в пространстве, то есть от величины плоских углов при вершинах параллелепипеда. У ромба есть два острых и два тупых угла (если это не квадрат).</p><p>Найдем косинус острого угла $\alpha$ ромба. По теореме косинусов для треугольника, образованного двумя сторонами ромба $a$ и меньшей диагональю $d_1$:</p><p>$d_1^2 = a^2 + a^2 - 2a^2 \cos \alpha$</p><p>$6^2 = 5^2 + 5^2 - 2 \cdot 5^2 \cos \alpha$</p><p>$36 = 50 - 50 \cos \alpha$</p><p>$50 \cos \alpha = 14$</p><p>$\cos \alpha = \frac{14}{50} = \frac{7}{25}$</p><p>Косинус тупого угла $\beta$ будет $\cos \beta = \cos(180^\circ - \alpha) = -\cos \alpha = -\frac{7}{25}$.</p><p>Поскольку в условии не указано, какие именно углы (острые или тупые) сходятся в вершинах параллелепипеда, существует два основных типа ромбоэдров, которые можно составить из данных ромбов.</p><strong>Случай 1: Острый ромбоэдр</strong><p>В этом случае в двух противоположных вершинах параллелепипеда сходятся три острых угла $\alpha$ ромбов. Объем такого ромбоэдра можно найти по формуле:</p><p>$V_1 = a^3 \sqrt{1 - 3\cos^2\alpha + 2\cos^3\alpha}$</p><p>Подставим наши значения $a=5$ и $\cos\alpha = 7/25$:</p><p>$V_1 = 5^3 \sqrt{1 - 3\left(\frac{7}{25}\right)^2 + 2\left(\frac{7}{25}\right)^3} = 125 \sqrt{1 - 3\frac{49}{625} + 2\frac{343}{15625}}$</p><p>$V_1 = 125 \sqrt{\frac{15625 - 3 \cdot 49 \cdot 25 + 2 \cdot 343}{15625}} = 125 \frac{\sqrt{15625 - 3675 + 686}}{125}$</p><p>$V_1 = \sqrt{12636} = \sqrt{324 \cdot 39} = 18\sqrt{39}$ см<sup>3</sup>.</p><p><strong>Ответ:</strong> $18\sqrt{39}$ см<sup>3</sup>.</p><strong>Случай 2: Тупой ромбоэдр</strong><p>В этом случае в двух противоположных вершинах параллелепипеда сходятся три тупых угла $\beta$ ромбов. Формула для объема будет аналогичной, но с использованием $\cos\beta$:</p><p>$V_2 = a^3 \sqrt{1 - 3\cos^2\beta + 2\cos^3\beta}$</p><p>Подставим наши значения $a=5$ и $\cos\beta = -7/25$:</p><p>$V_2 = 5^3 \sqrt{1 - 3\left(-\frac{7}{25}\right)^2 + 2\left(-\frac{7}{25}\right)^3} = 125 \sqrt{1 - 3\frac{49}{625} - 2\frac{343}{15625}}$</p><p>$V_2 = 125 \sqrt{\frac{15625 - 3 \cdot 49 \cdot 25 - 2 \cdot 343}{15625}} = 125 \frac{\sqrt{15625 - 3675 - 686}}{125}$</p><p>$V_2 = \sqrt{11264} = \sqrt{1024 \cdot 11} = 32\sqrt{11}$ см<sup>3</sup>.</p><p><strong>Ответ:</strong> $32\sqrt{11}$ см<sup>3</sup>.</p>"
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№474 (с. 131)
Условие. №474 (с. 131)
скриншот условия
Геометрия, 10-11 класс Учебник, авторы: Атанасян Левон Сергеевич, Бутузов Валентин Фёдорович, Кадомцев Сергей Борисович, Позняк Эдуард Генрихович, Киселёва Людмила Сергеевна, издательство Просвещение, Москва, 2019, коричневого цвета, страница 131, номер 474, Условие

474. Все грани параллелепипеда — равные ромбы, диагонали которых равны 6 см и 8 см. Найдите объём параллелепипеда.

Решение 3. №474 (с. 131)
Геометрия, 10-11 класс Учебник, авторы: Атанасян Левон Сергеевич, Бутузов Валентин Фёдорович, Кадомцев Сергей Борисович, Позняк Эдуард Генрихович, Киселёва Людмила Сергеевна, издательство Просвещение, Москва, 2019, коричневого цвета, страница 131, номер 474, Решение 3
Геометрия, 10-11 класс Учебник, авторы: Атанасян Левон Сергеевич, Бутузов Валентин Фёдорович, Кадомцев Сергей Борисович, Позняк Эдуард Генрихович, Киселёва Людмила Сергеевна, издательство Просвещение, Москва, 2019, коричневого цвета, страница 131, номер 474, Решение 3 (продолжение 2)
Решение 4. №474 (с. 131)
Геометрия, 10-11 класс Учебник, авторы: Атанасян Левон Сергеевич, Бутузов Валентин Фёдорович, Кадомцев Сергей Борисович, Позняк Эдуард Генрихович, Киселёва Людмила Сергеевна, издательство Просвещение, Москва, 2019, коричневого цвета, страница 131, номер 474, Решение 4
Решение 6. №474 (с. 131)

Поскольку все грани параллелепипеда — равные ромбы, такой многогранник называется ромбоэдром. Все его ребра равны между собой. Найдем сначала характеристики одной грани (ромба).

Пусть диагонали ромба равны $d_1 = 6$ см и $d_2 = 8$ см. Диагонали ромба пересекаются под прямым углом и делятся точкой пересечения пополам. Сторону ромба $a$ можно найти по теореме Пифагора из прямоугольного треугольника, катетами которого являются половины диагоналей:

$a = \sqrt{(d_1/2)^2 + (d_2/2)^2} = \sqrt{(6/2)^2 + (8/2)^2} = \sqrt{3^2 + 4^2} = \sqrt{9 + 16} = \sqrt{25} = 5$ см.

Таким образом, все ребра параллелепипеда равны $a = 5$ см.

Площадь ромба (которая будет площадью основания $S_{осн}$) равна половине произведения его диагоналей:

$S_{осн} = \frac{1}{2} d_1 d_2 = \frac{1}{2} \cdot 6 \cdot 8 = 24$ см2.

Объем параллелепипеда вычисляется по формуле $V = S_{осн} \cdot H$, где $H$ — высота. Высота зависит от того, как ромбы соединены в пространстве, то есть от величины плоских углов при вершинах параллелепипеда. У ромба есть два острых и два тупых угла (если это не квадрат).

Найдем косинус острого угла $\alpha$ ромба. По теореме косинусов для треугольника, образованного двумя сторонами ромба $a$ и меньшей диагональю $d_1$:

$d_1^2 = a^2 + a^2 - 2a^2 \cos \alpha$

$6^2 = 5^2 + 5^2 - 2 \cdot 5^2 \cos \alpha$

$36 = 50 - 50 \cos \alpha$

$50 \cos \alpha = 14$

$\cos \alpha = \frac{14}{50} = \frac{7}{25}$

Косинус тупого угла $\beta$ будет $\cos \beta = \cos(180^\circ - \alpha) = -\cos \alpha = -\frac{7}{25}$.

Поскольку в условии не указано, какие именно углы (острые или тупые) сходятся в вершинах параллелепипеда, существует два основных типа ромбоэдров, которые можно составить из данных ромбов.

Случай 1: Острый ромбоэдр

В этом случае в двух противоположных вершинах параллелепипеда сходятся три острых угла $\alpha$ ромбов. Объем такого ромбоэдра можно найти по формуле:

$V_1 = a^3 \sqrt{1 - 3\cos^2\alpha + 2\cos^3\alpha}$

Подставим наши значения $a=5$ и $\cos\alpha = 7/25$:

$V_1 = 5^3 \sqrt{1 - 3\left(\frac{7}{25}\right)^2 + 2\left(\frac{7}{25}\right)^3} = 125 \sqrt{1 - 3\frac{49}{625} + 2\frac{343}{15625}}$

$V_1 = 125 \sqrt{\frac{15625 - 3 \cdot 49 \cdot 25 + 2 \cdot 343}{15625}} = 125 \frac{\sqrt{15625 - 3675 + 686}}{125}$

$V_1 = \sqrt{12636} = \sqrt{324 \cdot 39} = 18\sqrt{39}$ см3.

Ответ: $18\sqrt{39}$ см3.

Случай 2: Тупой ромбоэдр

В этом случае в двух противоположных вершинах параллелепипеда сходятся три тупых угла $\beta$ ромбов. Формула для объема будет аналогичной, но с использованием $\cos\beta$:

$V_2 = a^3 \sqrt{1 - 3\cos^2\beta + 2\cos^3\beta}$

Подставим наши значения $a=5$ и $\cos\beta = -7/25$:

$V_2 = 5^3 \sqrt{1 - 3\left(-\frac{7}{25}\right)^2 + 2\left(-\frac{7}{25}\right)^3} = 125 \sqrt{1 - 3\frac{49}{625} - 2\frac{343}{15625}}$

$V_2 = 125 \sqrt{\frac{15625 - 3 \cdot 49 \cdot 25 - 2 \cdot 343}{15625}} = 125 \frac{\sqrt{15625 - 3675 - 686}}{125}$

$V_2 = \sqrt{11264} = \sqrt{1024 \cdot 11} = 32\sqrt{11}$ см3.

Ответ: $32\sqrt{11}$ см3.

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