Номер 350, страница 98 - 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 4. Цилиндр, конус и шар. Параграф 2. Конус - номер 350, страница 98.

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                    }
                    "field_level_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: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 {#1074
                      #items: array:1 [
                        0 => App\Models\Term {#1075
                          #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 {#1076
                      #items: array:1 [
                        0 => App\Models\Term {#1077
                          #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 {#1078
                      #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 {#1079
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1080
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1081
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_url" => "/10-klass/geometrija/atanasjan-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1082
                      #items: array:1 [
                        0 => App\Models\Term {#1083
                          #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
                    ]
                  ]
                  #original: array:50 [
                    "id" => 36
                    "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 {#1051}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1052}
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1055}
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1057}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1063}
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1064}
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1066}
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1068}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1070}
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1071}
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1072}
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1074}
                    "field_publication_number" => "11"
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1076}
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1078}
                    "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 {#1079}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1080}
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1081}
                    "field_url" => "/10-klass/geometrija/atanasjan-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1082}
                    "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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                  #attributeCastCache: []
                  #dateFormat: null
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                  #touches: []
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                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1084
              #items: []
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 744386
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Цилиндр, конус и шар"
            "field_branch_order" => "4"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1050}
            "field_page_start" => "89"
            "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 {#1086}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1084}
          ]
          #changes: []
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          #attributeCastCache: []
          #dateFormat: null
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          #dispatchesEvents: []
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          #touches: []
          +timestamps: true
          +usesUniqueIds: false
          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
      ]
      #escapeWhenCastingToString: false
    }
    "parent_branches" => Illuminate\Database\Eloquent\Collection {#1121
      #items: array:2 [
        0 => App\Models\Branch {#1129
          #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" => 744386
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Цилиндр, конус и шар"
            "field_branch_order" => "4"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1130
              #items: array:1 [
                0 => App\Models\Term {#1047}
              ]
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "89"
            "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 {#1131
              #items: array:1 [
                0 => App\Models\Book {#1049}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1132
              #items: []
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 744386
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Цилиндр, конус и шар"
            "field_branch_order" => "4"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1130}
            "field_page_start" => "89"
            "field_branch_display" => "0"
            "field_branch_expanded" => "0"
            "field_display_branch_in_title" => "1"
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            "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 {#1131}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1132}
          ]
          #changes: []
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          #classCastCache: []
          #attributeCastCache: []
          #dateFormat: null
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          #dispatchesEvents: []
          #observables: []
          #relations: []
          #touches: []
          +timestamps: true
          +usesUniqueIds: false
          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
        1 => App\Models\Branch {#1133
          #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" => 744388
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Конус"
            "field_branch_order" => "2"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1137
              #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: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: []
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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "94"
            "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 {#1136
              #items: array:1 [
                0 => App\Models\Book {#1049}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1135
              #items: array:1 [
                0 => App\Models\Branch {#1045}
              ]
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 744388
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Конус"
            "field_branch_order" => "2"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1137}
            "field_page_start" => "94"
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            "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 {#1136}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1135}
          ]
          #changes: []
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          #dateFormat: null
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          #touches: []
          +timestamps: true
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          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
      ]
      #escapeWhenCastingToString: false
    }
    "content" => Illuminate\Database\Eloquent\Collection {#1038
      #items: array:6 [
        0 => App\Models\Element {#1109
          #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" => 938999
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1098
              #items: array:1 [
                0 => App\Models\Edition {#1106
                  #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" => 2315
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Условие"
                    "field_order" => "1"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1105 …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" => "pasha"
                    "field_edition_type" => "statement"
                    "field_root_dir" => "0-"
                    "field_responsible" => Illuminate\Database\Eloquent\Collection {#1104 …2}
                    "field_comment" => null
                    "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1102 …2}
                    "field_process_formula" => "wiris"
                    "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1103 …2}
                    "field_content_source" => null
                  ]
                  #original: array:21 [
                    "id" => 2315
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Условие"
                    "field_order" => "1"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1105 …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" => "pasha"
                    "field_edition_type" => "statement"
                    "field_root_dir" => "0-"
                    "field_responsible" => Illuminate\Database\Eloquent\Collection {#1104 …2}
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            "text" => "<p> <b>350.</b> Осевое сечение конуса — правильный треугольник со стороной 2r. Найдите площадь сечения, проведённого через две образующие конуса, угол между которыми равен: <span class="long"> а) 30°; </span> <span class="long"> б) 45°; </span> <span class="long"> в) 60°.</span> </p>"
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            "text" => "<p> <b>350.</b> Осевое сечение конуса — правильный треугольник со стороной 2r. Найдите площадь сечения, проведённого через две образующие конуса, угол между которыми равен: <span class="long"> а) 30°; </span> <span class="long"> б) 45°; </span> <span class="long"> в) 60°.</span> </p>"
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                    "title" => "Решение 6"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1147 …2}
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            "text" => "<p>По условию, осевое сечение конуса — это правильный (равносторонний) треугольник, стороны которого равны $2r$. Сторонами этого треугольника являются две образующие конуса и диаметр его основания.</p><p>Это означает, что длина образующей конуса, которую мы обозначим как $L$, равна диаметру основания $D$. Таким образом, мы имеем: $L = D = 2r$.</p><p>Сечение, которое нам нужно найти, проведено через две образующие конуса. Это сечение представляет собой треугольник. Две его стороны — это образующие, каждая длиной $L = 2r$. Угол между этими образующими в вершине конуса обозначим как $\alpha$.</p><p>Площадь треугольника можно вычислить по формуле: $S = \frac{1}{2} a \cdot b \cdot \sin\gamma$, где $a$ и $b$ — две стороны, а $\gamma$ — угол между ними.</p><p>В нашем случае $a = L = 2r$, $b = L = 2r$, а угол $\gamma = \alpha$. Подставив эти значения в формулу, получим общую формулу для площади нашего сечения: $S = \frac{1}{2} \cdot L \cdot L \cdot \sin\alpha = \frac{1}{2} \cdot (2r)^2 \cdot \sin\alpha = \frac{1}{2} \cdot 4r^2 \cdot \sin\alpha = 2r^2 \sin\alpha$.</p><p>Теперь мы можем вычислить площадь для каждого из заданных углов.</p><p><strong>а)</strong> Если угол между образующими равен $30^{\circ}$, то $\alpha = 30^{\circ}$.<br>Подставляем значение в формулу: $S = 2r^2 \sin30^{\circ} = 2r^2 \cdot \frac{1}{2} = r^2$.<br>Ответ: $r^2$.</p><p><strong>б)</strong> Если угол между образующими равен $45^{\circ}$, то $\alpha = 45^{\circ}$.<br>Подставляем значение в формулу: $S = 2r^2 \sin45^{\circ} = 2r^2 \cdot \frac{\sqrt{2}}{2} = r^2\sqrt{2}$.<br>Ответ: $r^2\sqrt{2}$.</p><p><strong>в)</strong> Если угол между образующими равен $60^{\circ}$, то $\alpha = 60^{\circ}$.<br>Подставляем значение в формулу: $S = 2r^2 \sin60^{\circ} = 2r^2 \cdot \frac{\sqrt{3}}{2} = r^2\sqrt{3}$.<br>(В этом случае сечение является равносторонним треугольником со стороной $2r$, и его площадь также можно найти по формуле $S = \frac{a^2\sqrt{3}}{4} = \frac{(2r)^2\sqrt{3}}{4} = \frac{4r^2\sqrt{3}}{4} = r^2\sqrt{3}$, что подтверждает наш расчет).<br>Ответ: $r^2\sqrt{3}$.</p>"
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            "text" => "<p>По условию, осевое сечение конуса — это правильный (равносторонний) треугольник, стороны которого равны $2r$. Сторонами этого треугольника являются две образующие конуса и диаметр его основания.</p><p>Это означает, что длина образующей конуса, которую мы обозначим как $L$, равна диаметру основания $D$. Таким образом, мы имеем: $L = D = 2r$.</p><p>Сечение, которое нам нужно найти, проведено через две образующие конуса. Это сечение представляет собой треугольник. Две его стороны — это образующие, каждая длиной $L = 2r$. Угол между этими образующими в вершине конуса обозначим как $\alpha$.</p><p>Площадь треугольника можно вычислить по формуле: $S = \frac{1}{2} a \cdot b \cdot \sin\gamma$, где $a$ и $b$ — две стороны, а $\gamma$ — угол между ними.</p><p>В нашем случае $a = L = 2r$, $b = L = 2r$, а угол $\gamma = \alpha$. Подставив эти значения в формулу, получим общую формулу для площади нашего сечения: $S = \frac{1}{2} \cdot L \cdot L \cdot \sin\alpha = \frac{1}{2} \cdot (2r)^2 \cdot \sin\alpha = \frac{1}{2} \cdot 4r^2 \cdot \sin\alpha = 2r^2 \sin\alpha$.</p><p>Теперь мы можем вычислить площадь для каждого из заданных углов.</p><p><strong>а)</strong> Если угол между образующими равен $30^{\circ}$, то $\alpha = 30^{\circ}$.<br>Подставляем значение в формулу: $S = 2r^2 \sin30^{\circ} = 2r^2 \cdot \frac{1}{2} = r^2$.<br>Ответ: $r^2$.</p><p><strong>б)</strong> Если угол между образующими равен $45^{\circ}$, то $\alpha = 45^{\circ}$.<br>Подставляем значение в формулу: $S = 2r^2 \sin45^{\circ} = 2r^2 \cdot \frac{\sqrt{2}}{2} = r^2\sqrt{2}$.<br>Ответ: $r^2\sqrt{2}$.</p><p><strong>в)</strong> Если угол между образующими равен $60^{\circ}$, то $\alpha = 60^{\circ}$.<br>Подставляем значение в формулу: $S = 2r^2 \sin60^{\circ} = 2r^2 \cdot \frac{\sqrt{3}}{2} = r^2\sqrt{3}$.<br>(В этом случае сечение является равносторонним треугольником со стороной $2r$, и его площадь также можно найти по формуле $S = \frac{a^2\sqrt{3}}{4} = \frac{(2r)^2\sqrt{3}}{4} = \frac{4r^2\sqrt{3}}{4} = r^2\sqrt{3}$, что подтверждает наш расчет).<br>Ответ: $r^2\sqrt{3}$.</p>"
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                1 => App\Models\Task {#1285
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                4 => App\Models\Task {#1289
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                5 => App\Models\Task {#1309
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                6 => App\Models\Task {#1372
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                7 => App\Models\Task {#1375
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                8 => App\Models\Task {#1374
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                9 => App\Models\Task {#1376
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№350 (с. 98)
Условие. №350 (с. 98)
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 98, номер 350, Условие

350. Осевое сечение конуса — правильный треугольник со стороной 2r. Найдите площадь сечения, проведённого через две образующие конуса, угол между которыми равен: а) 30°; б) 45°; в) 60°.

Решение 2. №350 (с. 98)
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 98, номер 350, Решение 2
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 98, номер 350, Решение 2 (продолжение 2)
Решение 3. №350 (с. 98)
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 98, номер 350, Решение 3
Решение 4. №350 (с. 98)
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 98, номер 350, Решение 4
Решение 5. №350 (с. 98)
Решение 6. №350 (с. 98)

По условию, осевое сечение конуса — это правильный (равносторонний) треугольник, стороны которого равны $2r$. Сторонами этого треугольника являются две образующие конуса и диаметр его основания.

Это означает, что длина образующей конуса, которую мы обозначим как $L$, равна диаметру основания $D$. Таким образом, мы имеем: $L = D = 2r$.

Сечение, которое нам нужно найти, проведено через две образующие конуса. Это сечение представляет собой треугольник. Две его стороны — это образующие, каждая длиной $L = 2r$. Угол между этими образующими в вершине конуса обозначим как $\alpha$.

Площадь треугольника можно вычислить по формуле: $S = \frac{1}{2} a \cdot b \cdot \sin\gamma$, где $a$ и $b$ — две стороны, а $\gamma$ — угол между ними.

В нашем случае $a = L = 2r$, $b = L = 2r$, а угол $\gamma = \alpha$. Подставив эти значения в формулу, получим общую формулу для площади нашего сечения: $S = \frac{1}{2} \cdot L \cdot L \cdot \sin\alpha = \frac{1}{2} \cdot (2r)^2 \cdot \sin\alpha = \frac{1}{2} \cdot 4r^2 \cdot \sin\alpha = 2r^2 \sin\alpha$.

Теперь мы можем вычислить площадь для каждого из заданных углов.

а) Если угол между образующими равен $30^{\circ}$, то $\alpha = 30^{\circ}$.
Подставляем значение в формулу: $S = 2r^2 \sin30^{\circ} = 2r^2 \cdot \frac{1}{2} = r^2$.
Ответ: $r^2$.

б) Если угол между образующими равен $45^{\circ}$, то $\alpha = 45^{\circ}$.
Подставляем значение в формулу: $S = 2r^2 \sin45^{\circ} = 2r^2 \cdot \frac{\sqrt{2}}{2} = r^2\sqrt{2}$.
Ответ: $r^2\sqrt{2}$.

в) Если угол между образующими равен $60^{\circ}$, то $\alpha = 60^{\circ}$.
Подставляем значение в формулу: $S = 2r^2 \sin60^{\circ} = 2r^2 \cdot \frac{\sqrt{3}}{2} = r^2\sqrt{3}$.
(В этом случае сечение является равносторонним треугольником со стороной $2r$, и его площадь также можно найти по формуле $S = \frac{a^2\sqrt{3}}{4} = \frac{(2r)^2\sqrt{3}}{4} = \frac{4r^2\sqrt{3}}{4} = r^2\sqrt{3}$, что подтверждает наш расчет).
Ответ: $r^2\sqrt{3}$.

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Мы подготовили для вас ответ c подробным объяснением домашего задания по геометрии за 10-11 класс, для упражнения номер 350 расположенного на странице 98 к учебнику 2019 года издания для учащихся школ и гимназий.

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