Номер 2.59, страница 66 - гдз по геометрии 8 класс учебник Шыныбеков, Шыныбеков

Геометрия, 8 класс Учебник, авторы: Шыныбеков Абдухали Насырович, Шыныбеков Данияр Абдухалиевич, Жумабаев Ринат Нурланович, издательство Атамұра, Алматы, 2018

Авторы: Шыныбеков А. Н., Шыныбеков Д. А., Жумабаев Р. Н.

Тип: Учебник

Издательство: Атамұра

Год издания: 2018 - 2026

ISBN: 978-601-331-161-6

Рекомендовано Министерством образования и науки Республики Казахстан

Раздел 2. Соотношения между сторонами и углами прямоугольного треугольника. 2.2. Синус, тангенс и котангенс острого угла - номер 2.59, страница 66.

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                        0 => App\Models\Term {#1123
                          #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" => 6991
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Атамұра"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "atamu'ra"
                          ]
                          #original: array:6 [
                            "id" => 6991
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Атамұра"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "atamu'ra"
                          ]
                          #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 {#1124
                      #items: array:3 [
                        0 => App\Models\Term {#1125
                          #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" => 6992
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Шыныбеков"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Абдухали"
                            "field_patronymic" => "Насырович"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 6992
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Шыныбеков"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Абдухали"
                            "field_patronymic" => "Насырович"
                            "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 {#1126
                          #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" => 6993
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Шыныбеков"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Данияр"
                            "field_patronymic" => "Абдухалиевич"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 6993
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Шыныбеков"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Данияр"
                            "field_patronymic" => "Абдухалиевич"
                            "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 {#1127
                          #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" => 7001
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Жумабаев"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Ринат"
                            "field_patronymic" => "Нурланович"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 7001
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Жумабаев"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Ринат"
                            "field_patronymic" => "Нурланович"
                            "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 {#1128
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1129
                      #items: array:1 [
                        0 => App\Models\Term {#1130
                          #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 {#1131
                      #items: array:1 [
                        0 => App\Models\Term {#1132
                          #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" => 6994
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Казахстан"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "kazakhstan"
                          ]
                          #original: array:6 [
                            "id" => 6994
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Казахстан"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "kazakhstan"
                          ]
                          #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 {#1133
                      #items: array:1 [
                        0 => App\Models\Term {#1134
                          #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" => 6995
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almaty"
                          ]
                          #original: array:6 [
                            "id" => 6995
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almaty"
                          ]
                          #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 {#1135
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1136
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1137
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1138
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1139
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1140
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition_degree" => null
                    "field_cover_description" => null
                    "field_publication_year" => "2018"
                    "field_publication_year_until" => null
                    "field_part" => ""
                    "field_part_writing" => ""
                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для 8 класса общеобразовательных школ"
                    "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан"
                    "field_reserve_field" => null
                    "field_link_to_source" => null
                    "field_tasks_count" => "538"
                    "field_priority" => "6"
                    "field_default_folder" => "/geometrija_08/Shynybekov-u17/"
                    "field_isbn" => "978-601-331-161-6"
                    "field_cover" => array:1 [
                      0 => "/media/geometrija_08/Shynybekov-u17/covers/cover1.webp?ts=1753258124"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
                    "field_covers" => array:1 [
                      0 => array:4 [
                        "path" => "/media/geometrija_08/Shynybekov-u17/covers/cover1.webp?ts=1753258124"
                        "alt" => ""
                        "width" => "1632"
                        "height" => "2472"
                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1141
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1142
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1143
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_url" => "/8-klass/geometrija/shynybekov-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1144
                      #items: []
                      #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" => 379
                      "subject" => 543
                      "class_subject" => 390
                    ]
                  ]
                  #original: array:50 [
                    "id" => 2592
                    "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 {#1119}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1120}
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1122}
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1124}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1128}
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1129}
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1131}
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1133}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1135}
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1136}
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1137}
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1138}
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1139}
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1140}
                    "field_under_the_edition_degree" => null
                    "field_cover_description" => null
                    "field_publication_year" => "2018"
                    "field_publication_year_until" => null
                    "field_part" => ""
                    "field_part_writing" => ""
                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для 8 класса общеобразовательных школ"
                    "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан"
                    "field_reserve_field" => null
                    "field_link_to_source" => null
                    "field_tasks_count" => "538"
                    "field_priority" => "6"
                    "field_default_folder" => "/geometrija_08/Shynybekov-u17/"
                    "field_isbn" => "978-601-331-161-6"
                    "field_cover" => array:1 [
                      0 => "/media/geometrija_08/Shynybekov-u17/covers/cover1.webp?ts=1753258124"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
                    "field_covers" => array:1 [
                      0 => array:4 [
                        "path" => "/media/geometrija_08/Shynybekov-u17/covers/cover1.webp?ts=1753258124"
                        "alt" => ""
                        "width" => "1632"
                        "height" => "2472"
                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1141}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1142}
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1143}
                    "field_url" => "/8-klass/geometrija/shynybekov-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1144}
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "breadcrumbs" => array:3 [
                      "class" => 379
                      "subject" => 543
                      "class_subject" => 390
                    ]
                  ]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1145
              #items: []
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1122381
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Соотношения между сторонами и углами прямоугольного треугольника"
            "field_branch_order" => "2"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1118}
            "field_page_start" => "52"
            "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 {#1147}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1145}
          ]
          #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 {#1146
          #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" => 1122383
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "2.2. Синус, тангенс и котангенс острого угла"
            "field_branch_order" => null
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1148
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "60"
            "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 {#1149
              #items: array:1 [
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            "text" => "<p>Пусть дана равнобокая трапеция $ABCD$ с основаниями $AD$ и $BC$.</p><p>По условию задачи известно:</p><p><strong>1.</strong> $ABCD$ — равнобокая трапеция. Это означает, что боковые стороны равны ($AB = CD$) и углы при основаниях равны ($\angle{DAB} = \angle{CDA}$ и $\angle{ABC} = \angle{BCD}$).</p><p><strong>2.</strong> Диагональ $AC$ перпендикулярна боковой стороне $CD$, то есть $\angle{ACD} = 90^\circ$.</p><p><strong>3.</strong> Длины сторон связаны соотношением $AB = BC = CD = \frac{1}{2}AD$.</p><p>Для решения задачи обозначим длину стороны $CD$ как $x$. Тогда из условия (3) следует, что $AB = BC = CD = x$, а длина большего основания $AD = 2x$.</p><p>Рассмотрим треугольник $\triangle ACD$. Так как $\angle{ACD} = 90^\circ$, этот треугольник является прямоугольным. Стороны $AC$ и $CD$ — его катеты, а сторона $AD$, лежащая напротив прямого угла, — гипотенуза.</p><p>В этом треугольнике нам известны длины катета $CD = x$ и гипотенузы $AD = 2x$. Мы можем найти величину угла $\angle{CAD}$, который лежит напротив катета $CD$, используя определение синуса:</p><p>$\sin(\angle{CAD}) = \frac{\text{противолежащий катет}}{\text{гипотенуза}} = \frac{CD}{AD} = \frac{x}{2x} = \frac{1}{2}$</p><p>Из этого соотношения следует, что угол $\angle{CAD}$ равен $30^\circ$.</p><p>Сумма острых углов в прямоугольном треугольнике равна $90^\circ$. Следовательно, мы можем найти второй острый угол $\triangle ACD$, который также является углом $\angle{D}$ трапеции:</p><p>$\angle{CDA} = 90^\circ - \angle{CAD} = 90^\circ - 30^\circ = 60^\circ$</p><p>Поскольку трапеция $ABCD$ является равнобокой, ее углы при большем основании $AD$ равны:</p><p>$\angle{DAB} = \angle{CDA} = 60^\circ$</p><p>Сумма углов, прилежащих к одной боковой стороне трапеции, равна $180^\circ$. Используя это свойство, найдем углы при меньшем основании $BC$:</p><p>$\angle{BCD} = 180^\circ - \angle{CDA} = 180^\circ - 60^\circ = 120^\circ$</p><p>Так как трапеция равнобокая, углы при меньшем основании также равны между собой:</p><p>$\angle{ABC} = \angle{BCD} = 120^\circ$</p><p>Таким образом, мы нашли все углы трапеции. Проверим, что все исходные условия задачи выполнены. Мы уже использовали условия $\angle{ACD}=90^\circ$ и $CD = \frac{1}{2}AD$. Осталось убедиться, что $BC = CD$.</p><p>Поскольку основания трапеции параллельны ($BC \parallel AD$), накрест лежащие углы при секущей $AC$ равны: $\angle{BCA} = \angle{CAD} = 30^\circ$.</p><p>Угол $\angle{BAC}$ можно найти как разность: $\angle{BAC} = \angle{DAB} - \angle{CAD} = 60^\circ - 30^\circ = 30^\circ$.</p><p>В треугольнике $\triangle ABC$ два угла равны ($\angle{BAC} = \angle{BCA} = 30^\circ$), следовательно, он является равнобедренным с основанием $AC$, и его боковые стороны равны: $AB = BC$. Так как трапеция равнобокая ($AB = CD$), то $BC = CD$, что полностью соответствует условию задачи.</p><p>Ответ: углы трапеции равны $60^\circ, 120^\circ, 120^\circ, 60^\circ$.</p>"
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            "text" => "<p>Пусть дана равнобокая трапеция $ABCD$ с основаниями $AD$ и $BC$.</p><p>По условию задачи известно:</p><p><strong>1.</strong> $ABCD$ — равнобокая трапеция. Это означает, что боковые стороны равны ($AB = CD$) и углы при основаниях равны ($\angle{DAB} = \angle{CDA}$ и $\angle{ABC} = \angle{BCD}$).</p><p><strong>2.</strong> Диагональ $AC$ перпендикулярна боковой стороне $CD$, то есть $\angle{ACD} = 90^\circ$.</p><p><strong>3.</strong> Длины сторон связаны соотношением $AB = BC = CD = \frac{1}{2}AD$.</p><p>Для решения задачи обозначим длину стороны $CD$ как $x$. Тогда из условия (3) следует, что $AB = BC = CD = x$, а длина большего основания $AD = 2x$.</p><p>Рассмотрим треугольник $\triangle ACD$. Так как $\angle{ACD} = 90^\circ$, этот треугольник является прямоугольным. Стороны $AC$ и $CD$ — его катеты, а сторона $AD$, лежащая напротив прямого угла, — гипотенуза.</p><p>В этом треугольнике нам известны длины катета $CD = x$ и гипотенузы $AD = 2x$. Мы можем найти величину угла $\angle{CAD}$, который лежит напротив катета $CD$, используя определение синуса:</p><p>$\sin(\angle{CAD}) = \frac{\text{противолежащий катет}}{\text{гипотенуза}} = \frac{CD}{AD} = \frac{x}{2x} = \frac{1}{2}$</p><p>Из этого соотношения следует, что угол $\angle{CAD}$ равен $30^\circ$.</p><p>Сумма острых углов в прямоугольном треугольнике равна $90^\circ$. Следовательно, мы можем найти второй острый угол $\triangle ACD$, который также является углом $\angle{D}$ трапеции:</p><p>$\angle{CDA} = 90^\circ - \angle{CAD} = 90^\circ - 30^\circ = 60^\circ$</p><p>Поскольку трапеция $ABCD$ является равнобокой, ее углы при большем основании $AD$ равны:</p><p>$\angle{DAB} = \angle{CDA} = 60^\circ$</p><p>Сумма углов, прилежащих к одной боковой стороне трапеции, равна $180^\circ$. Используя это свойство, найдем углы при меньшем основании $BC$:</p><p>$\angle{BCD} = 180^\circ - \angle{CDA} = 180^\circ - 60^\circ = 120^\circ$</p><p>Так как трапеция равнобокая, углы при меньшем основании также равны между собой:</p><p>$\angle{ABC} = \angle{BCD} = 120^\circ$</p><p>Таким образом, мы нашли все углы трапеции. Проверим, что все исходные условия задачи выполнены. Мы уже использовали условия $\angle{ACD}=90^\circ$ и $CD = \frac{1}{2}AD$. Осталось убедиться, что $BC = CD$.</p><p>Поскольку основания трапеции параллельны ($BC \parallel AD$), накрест лежащие углы при секущей $AC$ равны: $\angle{BCA} = \angle{CAD} = 30^\circ$.</p><p>Угол $\angle{BAC}$ можно найти как разность: $\angle{BAC} = \angle{DAB} - \angle{CAD} = 60^\circ - 30^\circ = 30^\circ$.</p><p>В треугольнике $\triangle ABC$ два угла равны ($\angle{BAC} = \angle{BCA} = 30^\circ$), следовательно, он является равнобедренным с основанием $AC$, и его боковые стороны равны: $AB = BC$. Так как трапеция равнобокая ($AB = CD$), то $BC = CD$, что полностью соответствует условию задачи.</p><p>Ответ: углы трапеции равны $60^\circ, 120^\circ, 120^\circ, 60^\circ$.</p>"
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№2.59 (с. 66)
Учебник rus. №2.59 (с. 66)
скриншот условия
Геометрия, 8 класс Учебник, авторы: Шыныбеков Абдухали Насырович, Шыныбеков Данияр Абдухалиевич, Жумабаев Ринат Нурланович, издательство Атамұра, Алматы, 2018, страница 66, номер 2.59, Учебник rus

2.59. ABCD - равнобокая трапеция, в которой $AC \perp CD$, $AB = BC = CD = \frac{1}{2} AD$. Найдите углы этой трапеции.

Учебник kz. №2.59 (с. 66)
Геометрия, 8 класс Учебник, авторы: Шыныбеков Абдухали Насырович, Шыныбеков Данияр Абдухалиевич, Жумабаев Ринат Нурланович, издательство Атамұра, Алматы, 2018, страница 66, номер 2.59, Учебник kz
Решение. №2.59 (с. 66)
Геометрия, 8 класс Учебник, авторы: Шыныбеков Абдухали Насырович, Шыныбеков Данияр Абдухалиевич, Жумабаев Ринат Нурланович, издательство Атамұра, Алматы, 2018, страница 66, номер 2.59, Решение
Решение 2 rus. №2.59 (с. 66)

Пусть дана равнобокая трапеция $ABCD$ с основаниями $AD$ и $BC$.

По условию задачи известно:

1. $ABCD$ — равнобокая трапеция. Это означает, что боковые стороны равны ($AB = CD$) и углы при основаниях равны ($\angle{DAB} = \angle{CDA}$ и $\angle{ABC} = \angle{BCD}$).

2. Диагональ $AC$ перпендикулярна боковой стороне $CD$, то есть $\angle{ACD} = 90^\circ$.

3. Длины сторон связаны соотношением $AB = BC = CD = \frac{1}{2}AD$.

Для решения задачи обозначим длину стороны $CD$ как $x$. Тогда из условия (3) следует, что $AB = BC = CD = x$, а длина большего основания $AD = 2x$.

Рассмотрим треугольник $\triangle ACD$. Так как $\angle{ACD} = 90^\circ$, этот треугольник является прямоугольным. Стороны $AC$ и $CD$ — его катеты, а сторона $AD$, лежащая напротив прямого угла, — гипотенуза.

В этом треугольнике нам известны длины катета $CD = x$ и гипотенузы $AD = 2x$. Мы можем найти величину угла $\angle{CAD}$, который лежит напротив катета $CD$, используя определение синуса:

$\sin(\angle{CAD}) = \frac{\text{противолежащий катет}}{\text{гипотенуза}} = \frac{CD}{AD} = \frac{x}{2x} = \frac{1}{2}$

Из этого соотношения следует, что угол $\angle{CAD}$ равен $30^\circ$.

Сумма острых углов в прямоугольном треугольнике равна $90^\circ$. Следовательно, мы можем найти второй острый угол $\triangle ACD$, который также является углом $\angle{D}$ трапеции:

$\angle{CDA} = 90^\circ - \angle{CAD} = 90^\circ - 30^\circ = 60^\circ$

Поскольку трапеция $ABCD$ является равнобокой, ее углы при большем основании $AD$ равны:

$\angle{DAB} = \angle{CDA} = 60^\circ$

Сумма углов, прилежащих к одной боковой стороне трапеции, равна $180^\circ$. Используя это свойство, найдем углы при меньшем основании $BC$:

$\angle{BCD} = 180^\circ - \angle{CDA} = 180^\circ - 60^\circ = 120^\circ$

Так как трапеция равнобокая, углы при меньшем основании также равны между собой:

$\angle{ABC} = \angle{BCD} = 120^\circ$

Таким образом, мы нашли все углы трапеции. Проверим, что все исходные условия задачи выполнены. Мы уже использовали условия $\angle{ACD}=90^\circ$ и $CD = \frac{1}{2}AD$. Осталось убедиться, что $BC = CD$.

Поскольку основания трапеции параллельны ($BC \parallel AD$), накрест лежащие углы при секущей $AC$ равны: $\angle{BCA} = \angle{CAD} = 30^\circ$.

Угол $\angle{BAC}$ можно найти как разность: $\angle{BAC} = \angle{DAB} - \angle{CAD} = 60^\circ - 30^\circ = 30^\circ$.

В треугольнике $\triangle ABC$ два угла равны ($\angle{BAC} = \angle{BCA} = 30^\circ$), следовательно, он является равнобедренным с основанием $AC$, и его боковые стороны равны: $AB = BC$. Так как трапеция равнобокая ($AB = CD$), то $BC = CD$, что полностью соответствует условию задачи.

Ответ: углы трапеции равны $60^\circ, 120^\circ, 120^\circ, 60^\circ$.

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