Номер 325, страница 92 - 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 1. Цилиндр - номер 325, страница 92.

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                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1068
                      #items: array:1 [
                        0 => App\Models\Term {#1069
                          #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 {#1070
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1071
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "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
                    ]
                  ]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
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                  #dispatchesEvents: []
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                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #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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          #relations: []
          #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"
            "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}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1132}
          ]
          #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 {#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" => 744387
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Цилиндр"
            "field_branch_order" => "1"
            "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: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #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 {#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" => 744387
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Цилиндр"
            "field_branch_order" => "1"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1137}
            "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 {#1136}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1135}
          ]
          #changes: []
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          #classCastCache: []
          #attributeCastCache: []
          #dateFormat: null
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          #dispatchesEvents: []
          #observables: []
          #relations: []
          #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" => 938974
            "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"
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            "text" => "<p> <b>325.</b> Площадь основания цилиндра относится к площади осевого сечения как <span class="long"> <span class="squareroot">3</span>π : 4.</span> Найдите: а) угол между диагональю осевого сечения цилиндра и плоскостью основания; б) угол между диагоналями осевого сечения. </p>"
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            "text" => "<p> <b>325.</b> Площадь основания цилиндра относится к площади осевого сечения как <span class="long"> <span class="squareroot">3</span>π : 4.</span> Найдите: а) угол между диагональю осевого сечения цилиндра и плоскостью основания; б) угол между диагоналями осевого сечения. </p>"
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            "text" => "<p>Пусть $r$ — радиус основания цилиндра, а $h$ — его высота.</p><p>Площадь основания цилиндра, $S_{осн}$, вычисляется по формуле площади круга: $S_{осн} = \pi r^2$.</p><p>Осевое сечение цилиндра — это прямоугольник со сторонами, равными диаметру основания ($d = 2r$) и высоте цилиндра ($h$). Площадь осевого сечения, $S_{сеч}$, равна: $S_{сеч} = d \cdot h = 2rh$.</p><p>По условию задачи, отношение площади основания к площади осевого сечения равно $\sqrt{3}\pi : 4$: $\frac{S_{осн}}{S_{сеч}} = \frac{\pi r^2}{2rh} = \frac{\sqrt{3}\pi}{4}$.</p><p>Упростим это выражение, чтобы найти соотношение между высотой и радиусом. Сократим $\pi$ и $r$ в левой части: $\frac{r}{2h} = \frac{\sqrt{3}}{4}$.</p><p>Из этого равенства найдем отношение высоты $h$ к диаметру $2r$. Умножим обе части на 2: $\frac{r}{h} = \frac{2\sqrt{3}}{4} = \frac{\sqrt{3}}{2}$.</p><p>Тогда отношение высоты к диаметру будет: $\frac{h}{2r} = \frac{1}{2} \cdot \frac{h}{r} = \frac{1}{2} \cdot \frac{2}{\sqrt{3}} = \frac{1}{\sqrt{3}} = \frac{\sqrt{3}}{3}$.</p><p><strong>а)</strong> Угол между диагональю осевого сечения и плоскостью основания — это угол $\alpha$ между диагональю прямоугольника сечения и его стороной, которая является диаметром основания ($2r$). Рассмотрим прямоугольный треугольник, образованный диагональю сечения (гипотенуза), высотой цилиндра $h$ (катет, противолежащий искомому углу $\alpha$) и диаметром основания $2r$ (катет, прилежащий к углу $\alpha$).</p><p>Тангенс этого угла $\alpha$ равен отношению противолежащего катета к прилежащему: $\tan(\alpha) = \frac{h}{2r}$.</p><p>Как мы нашли ранее, $\frac{h}{2r} = \frac{\sqrt{3}}{3}$. Следовательно, $\tan(\alpha) = \frac{\sqrt{3}}{3}$.</p><p>Угол, тангенс которого равен $\frac{\sqrt{3}}{3}$, составляет $30^\circ$.</p><p>Ответ: $30^\circ$.</p><p><strong>б)</strong> Угол между диагоналями осевого сечения. Осевое сечение — это прямоугольник со сторонами $h$ и $2r$. Диагонали прямоугольника в точке пересечения делятся пополам.</p><p>Пусть $\beta$ — искомый угол между диагоналями. Рассмотрим равнобедренный треугольник, образованный двумя половинами диагоналей и стороной прямоугольника $h$. Угол при вершине этого треугольника (в точке пересечения диагоналей) является одним из углов между диагоналями. Опустим из этой вершины высоту на сторону $h$. Эта высота будет равна половине другой стороны прямоугольника, то есть $r$.</p><p>Рассмотрим получившийся прямоугольный треугольник. Его катеты равны $r$ и $\frac{h}{2}$. Угол, противолежащий катету $r$, равен $\frac{\beta}{2}$. Тангенс этого угла: $\tan(\frac{\beta}{2}) = \frac{\text{противолежащий катет}}{\text{прилежащий катет}} = \frac{r}{h/2} = \frac{2r}{h}$.</p><p>Из соотношения $\frac{r}{h} = \frac{\sqrt{3}}{2}$ следует, что $\frac{2r}{h} = \sqrt{3}$. Итак, $\tan(\frac{\beta}{2}) = \sqrt{3}$.</p><p>Это означает, что $\frac{\beta}{2} = 60^\circ$, и, следовательно, $\beta = 120^\circ$.</p><p>Диагонали при пересечении образуют две пары вертикальных углов. Один угол равен $120^\circ$ (тупой), а смежный с ним — $180^\circ - 120^\circ = 60^\circ$ (острый). Обычно под углом между прямыми понимают острый угол.</p><p>Ответ: $60^\circ$.</p>"
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            "text" => "<p>Пусть $r$ — радиус основания цилиндра, а $h$ — его высота.</p><p>Площадь основания цилиндра, $S_{осн}$, вычисляется по формуле площади круга: $S_{осн} = \pi r^2$.</p><p>Осевое сечение цилиндра — это прямоугольник со сторонами, равными диаметру основания ($d = 2r$) и высоте цилиндра ($h$). Площадь осевого сечения, $S_{сеч}$, равна: $S_{сеч} = d \cdot h = 2rh$.</p><p>По условию задачи, отношение площади основания к площади осевого сечения равно $\sqrt{3}\pi : 4$: $\frac{S_{осн}}{S_{сеч}} = \frac{\pi r^2}{2rh} = \frac{\sqrt{3}\pi}{4}$.</p><p>Упростим это выражение, чтобы найти соотношение между высотой и радиусом. Сократим $\pi$ и $r$ в левой части: $\frac{r}{2h} = \frac{\sqrt{3}}{4}$.</p><p>Из этого равенства найдем отношение высоты $h$ к диаметру $2r$. Умножим обе части на 2: $\frac{r}{h} = \frac{2\sqrt{3}}{4} = \frac{\sqrt{3}}{2}$.</p><p>Тогда отношение высоты к диаметру будет: $\frac{h}{2r} = \frac{1}{2} \cdot \frac{h}{r} = \frac{1}{2} \cdot \frac{2}{\sqrt{3}} = \frac{1}{\sqrt{3}} = \frac{\sqrt{3}}{3}$.</p><p><strong>а)</strong> Угол между диагональю осевого сечения и плоскостью основания — это угол $\alpha$ между диагональю прямоугольника сечения и его стороной, которая является диаметром основания ($2r$). Рассмотрим прямоугольный треугольник, образованный диагональю сечения (гипотенуза), высотой цилиндра $h$ (катет, противолежащий искомому углу $\alpha$) и диаметром основания $2r$ (катет, прилежащий к углу $\alpha$).</p><p>Тангенс этого угла $\alpha$ равен отношению противолежащего катета к прилежащему: $\tan(\alpha) = \frac{h}{2r}$.</p><p>Как мы нашли ранее, $\frac{h}{2r} = \frac{\sqrt{3}}{3}$. Следовательно, $\tan(\alpha) = \frac{\sqrt{3}}{3}$.</p><p>Угол, тангенс которого равен $\frac{\sqrt{3}}{3}$, составляет $30^\circ$.</p><p>Ответ: $30^\circ$.</p><p><strong>б)</strong> Угол между диагоналями осевого сечения. Осевое сечение — это прямоугольник со сторонами $h$ и $2r$. Диагонали прямоугольника в точке пересечения делятся пополам.</p><p>Пусть $\beta$ — искомый угол между диагоналями. Рассмотрим равнобедренный треугольник, образованный двумя половинами диагоналей и стороной прямоугольника $h$. Угол при вершине этого треугольника (в точке пересечения диагоналей) является одним из углов между диагоналями. Опустим из этой вершины высоту на сторону $h$. Эта высота будет равна половине другой стороны прямоугольника, то есть $r$.</p><p>Рассмотрим получившийся прямоугольный треугольник. Его катеты равны $r$ и $\frac{h}{2}$. Угол, противолежащий катету $r$, равен $\frac{\beta}{2}$. Тангенс этого угла: $\tan(\frac{\beta}{2}) = \frac{\text{противолежащий катет}}{\text{прилежащий катет}} = \frac{r}{h/2} = \frac{2r}{h}$.</p><p>Из соотношения $\frac{r}{h} = \frac{\sqrt{3}}{2}$ следует, что $\frac{2r}{h} = \sqrt{3}$. Итак, $\tan(\frac{\beta}{2}) = \sqrt{3}$.</p><p>Это означает, что $\frac{\beta}{2} = 60^\circ$, и, следовательно, $\beta = 120^\circ$.</p><p>Диагонали при пересечении образуют две пары вертикальных углов. Один угол равен $120^\circ$ (тупой), а смежный с ним — $180^\circ - 120^\circ = 60^\circ$ (острый). Обычно под углом между прямыми понимают острый угол.</p><p>Ответ: $60^\circ$.</p>"
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№325 (с. 92)
Условие. №325 (с. 92)
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 92, номер 325, Условие

325. Площадь основания цилиндра относится к площади осевого сечения как 3π : 4. Найдите: а) угол между диагональю осевого сечения цилиндра и плоскостью основания; б) угол между диагоналями осевого сечения.

Решение 2. №325 (с. 92)
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 92, номер 325, 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 92, номер 325, Решение 2 (продолжение 2)
Решение 3. №325 (с. 92)
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 92, номер 325, 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 92, номер 325, Решение 3 (продолжение 2)
Решение 4. №325 (с. 92)
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 92, номер 325, Решение 4
Решение 5. №325 (с. 92)
Решение 6. №325 (с. 92)

Пусть $r$ — радиус основания цилиндра, а $h$ — его высота.

Площадь основания цилиндра, $S_{осн}$, вычисляется по формуле площади круга: $S_{осн} = \pi r^2$.

Осевое сечение цилиндра — это прямоугольник со сторонами, равными диаметру основания ($d = 2r$) и высоте цилиндра ($h$). Площадь осевого сечения, $S_{сеч}$, равна: $S_{сеч} = d \cdot h = 2rh$.

По условию задачи, отношение площади основания к площади осевого сечения равно $\sqrt{3}\pi : 4$: $\frac{S_{осн}}{S_{сеч}} = \frac{\pi r^2}{2rh} = \frac{\sqrt{3}\pi}{4}$.

Упростим это выражение, чтобы найти соотношение между высотой и радиусом. Сократим $\pi$ и $r$ в левой части: $\frac{r}{2h} = \frac{\sqrt{3}}{4}$.

Из этого равенства найдем отношение высоты $h$ к диаметру $2r$. Умножим обе части на 2: $\frac{r}{h} = \frac{2\sqrt{3}}{4} = \frac{\sqrt{3}}{2}$.

Тогда отношение высоты к диаметру будет: $\frac{h}{2r} = \frac{1}{2} \cdot \frac{h}{r} = \frac{1}{2} \cdot \frac{2}{\sqrt{3}} = \frac{1}{\sqrt{3}} = \frac{\sqrt{3}}{3}$.

а) Угол между диагональю осевого сечения и плоскостью основания — это угол $\alpha$ между диагональю прямоугольника сечения и его стороной, которая является диаметром основания ($2r$). Рассмотрим прямоугольный треугольник, образованный диагональю сечения (гипотенуза), высотой цилиндра $h$ (катет, противолежащий искомому углу $\alpha$) и диаметром основания $2r$ (катет, прилежащий к углу $\alpha$).

Тангенс этого угла $\alpha$ равен отношению противолежащего катета к прилежащему: $\tan(\alpha) = \frac{h}{2r}$.

Как мы нашли ранее, $\frac{h}{2r} = \frac{\sqrt{3}}{3}$. Следовательно, $\tan(\alpha) = \frac{\sqrt{3}}{3}$.

Угол, тангенс которого равен $\frac{\sqrt{3}}{3}$, составляет $30^\circ$.

Ответ: $30^\circ$.

б) Угол между диагоналями осевого сечения. Осевое сечение — это прямоугольник со сторонами $h$ и $2r$. Диагонали прямоугольника в точке пересечения делятся пополам.

Пусть $\beta$ — искомый угол между диагоналями. Рассмотрим равнобедренный треугольник, образованный двумя половинами диагоналей и стороной прямоугольника $h$. Угол при вершине этого треугольника (в точке пересечения диагоналей) является одним из углов между диагоналями. Опустим из этой вершины высоту на сторону $h$. Эта высота будет равна половине другой стороны прямоугольника, то есть $r$.

Рассмотрим получившийся прямоугольный треугольник. Его катеты равны $r$ и $\frac{h}{2}$. Угол, противолежащий катету $r$, равен $\frac{\beta}{2}$. Тангенс этого угла: $\tan(\frac{\beta}{2}) = \frac{\text{противолежащий катет}}{\text{прилежащий катет}} = \frac{r}{h/2} = \frac{2r}{h}$.

Из соотношения $\frac{r}{h} = \frac{\sqrt{3}}{2}$ следует, что $\frac{2r}{h} = \sqrt{3}$. Итак, $\tan(\frac{\beta}{2}) = \sqrt{3}$.

Это означает, что $\frac{\beta}{2} = 60^\circ$, и, следовательно, $\beta = 120^\circ$.

Диагонали при пересечении образуют две пары вертикальных углов. Один угол равен $120^\circ$ (тупой), а смежный с ним — $180^\circ - 120^\circ = 60^\circ$ (острый). Обычно под углом между прямыми понимают острый угол.

Ответ: $60^\circ$.

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