Номер 471, страница 130 - гдз по геометрии 10-11 класс учебник Атанасян, Бутузов

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

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

Тип: Учебник

Издательство: Просвещение

Год издания: 2019 - 2026

Уровень обучения: базовый и углублённый

Цвет обложки: коричневый с ромбами

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

Допущено Министерством просвещения Российской Федерации

Математика: алгебра и начала математического анализа, геометрия

Глава 5. Объёмы тел. Параграф 3. Объёмы наклонной призмы, пирамиды и конуса - номер 471, страница 130.

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                            "created_at" => "2026-04-10 13:58:26"
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                            "field_name" => "Людмила"
                            "field_patronymic" => "Сергеевна"
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                          ]
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                          ]
                        }
                      ]
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                    }
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                      #items: []
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                    }
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                        0 => App\Models\Term {#1065
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
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                          #attributes: array:10 [
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                            "field_cases" => array:6 [ …6]
                            "field_plural_form" => null
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                          ]
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                      ]
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                        0 => App\Models\Term {#1067
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                            "field_translit" => "rossiya"
                          ]
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                    "field_city" => Illuminate\Database\Eloquent\Collection {#1068
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                        0 => App\Models\Term {#1069
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
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                          #attributes: array:6 [
                            "id" => 15
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Москва"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "moskva"
                          ]
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                            "updated_at" => null
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                      ]
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                    }
                    "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"
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                            "id" => 41
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                            "field_cases" => array:6 [ …6]
                            "field_translit" => "bazovyy i uglublennyy"
                          ]
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                            "field_translit" => "bazovyy i uglublennyy"
                          ]
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                          ]
                        }
                      ]
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                    }
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1074
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                        0 => App\Models\Term {#1075
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
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                          #attributes: array:10 [
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "ФГОС (старый)"
                            "field_cases" => array:6 [ …6]
                            "field_color" => null
                            "field_end_year" => "2022"
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                          ]
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                            "field_color" => null
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                          ]
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                      ]
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                    "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"
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "стереотипное"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "stereotipnoe"
                          ]
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                            "id" => 33
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "стереотипное"
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                          ]
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                      ]
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                    }
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1078
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition_degree" => null
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                    "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"
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                    "field_cover" => array:1 [
                      0 => "/media/geometrija_10/atanasjan-u23/covers/cover1.webp?ts=1739363242"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
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                        "alt" => ""
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                      ]
                    ]
                    "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"
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                          #attributes: array:6 [
                            "id" => 51
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "коричневый"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "korichnevyy"
                          ]
                          #original: array:6 [
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "коричневый"
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                            "field_translit" => "korichnevyy"
                          ]
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                      ]
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                    ]
                  ]
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1051}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1052}
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                    "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}
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                    "field_part" => ""
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                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для общеобразовательных организаций"
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                    "field_link_to_source" => null
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                      0 => "/media/geometrija_10/atanasjan-u23/covers/cover1.webp?ts=1739363242"
                    ]
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                      ]
                    ]
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                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1080}
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                    "field_url" => "/10-klass/geometrija/atanasjan-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1082}
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                    "breadcrumbs" => array:3 [
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                  ]
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                    0 => "*"
                  ]
                }
              ]
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            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1084
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              #escapeWhenCastingToString: false
            }
          ]
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            "updated_at" => null
            "field_display_title" => "Объёмы тел"
            "field_branch_order" => "5"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1050}
            "field_page_start" => "116"
            "field_branch_display" => "0"
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            "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
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            "field_branch_cover" => []
            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1086}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1084}
          ]
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            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" => 744392
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Объёмы тел"
            "field_branch_order" => "5"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1130
              #items: array:1 [
                0 => App\Models\Term {#1047}
              ]
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "116"
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            "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
              #items: array:1 [
                0 => App\Models\Book {#1049}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1132
              #items: []
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 744392
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Объёмы тел"
            "field_branch_order" => "5"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1130}
            "field_page_start" => "116"
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            "field_branch_cover" => []
            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1131}
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            0 => "*"
          ]
        }
        1 => App\Models\Branch {#1133
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
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          #attributes: array:24 [
            "id" => 744395
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Объёмы наклонной призмы, пирамиды и конуса"
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            "field_url" => null
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              #items: array:1 [
                0 => App\Models\Term {#1134
                  #connection: "mysql"
                  #table: "terms"
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                  #keyType: "int"
                  +incrementing: false
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                  #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
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                  ]
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                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Параграф"
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            }
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                0 => App\Models\Branch {#1045}
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      #escapeWhenCastingToString: false
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    "content" => Illuminate\Database\Eloquent\Collection {#1118
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        0 => App\Models\Element {#1108
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            "id" => 939120
            "created_at" => "2026-04-10 13:58:26"
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                  #connection: "mysql"
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                  +exists: true
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                  #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 {#1107 …2}
                    "field_content_type" => "free"
                    "field_content_mode" => "text, image"
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                    "field_content_text_checked" => null
                    "field_page_content_text_checked" => "0"
                    "field_solution_author" => "Автор"
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                  ]
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                    0 => "*"
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              ]
              #escapeWhenCastingToString: false
            }
            "task" => array:2 [
              "refs" => "744886"
              "type" => "task"
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            "text" => "<p> <b>471.</b> Основанием призмы ABCA₁B₁C₁ является равносторонний треугольник ABC со стороной m. Вершина А₁ проектируется в центр этого основания, а ребро АА₁ составляет с плоскостью основания угол φ. Найдите объём призмы. </p>"
            "img" => array:1 [
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                "width" => "1565"
                "height" => 266
                "path" => "/media/geometrija_10/atanasjan-u23/0-00/471-1.webp?ts=1739436659"
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            "id" => 939120
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1101}
            "task" => array:2 [
              "refs" => "744886"
              "type" => "task"
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            "text" => "<p> <b>471.</b> Основанием призмы ABCA₁B₁C₁ является равносторонний треугольник ABC со стороной m. Вершина А₁ проектируется в центр этого основания, а ребро АА₁ составляет с плоскостью основания угол φ. Найдите объём призмы. </p>"
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        1 => App\Models\Element {#1087
          #connection: "mysql"
          #table: "elements"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
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                0 => App\Models\Edition {#1043
                  #connection: "mysql"
                  #table: "editions"
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                  #keyType: "int"
                  +incrementing: false
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                  #attributes: array:21 [
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                  ]
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                    "title" => "Решение 2"
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                    0 => "*"
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            "task" => array:2 [
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            "img" => array:1 [
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                "width" => "694"
                "height" => 2124
                "path" => "/media/geometrija_10/atanasjan-u23/2-00/471-1.webp?ts=1739441325"
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          ]
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            0 => "*"
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        2 => App\Models\Element {#1095
          #connection: "mysql"
          #table: "elements"
          #primaryKey: "id"
          #keyType: "int"
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          #attributes: array:6 [
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            "created_at" => "2026-04-10 13:58:26"
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                0 => App\Models\Edition {#1094
                  #connection: "mysql"
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                  +incrementing: false
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                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
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                    "updated_at" => null
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                    0 => "*"
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        3 => App\Models\Element {#1103
          #connection: "mysql"
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                  #connection: "mysql"
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                    "created_at" => "2026-04-10 13:58:26"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1099 …2}
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                  ]
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                    "updated_at" => null
                    "title" => "Решение 4"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1099 …2}
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        4 => App\Models\Element {#1124
          #connection: "mysql"
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          #attributes: array:6 [
            "id" => 1352199
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1144
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                0 => App\Models\Edition {#1122
                  #connection: "mysql"
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                  #attributes: array:21 [
                    "id" => 5120
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Решение 6"
                    "field_order" => "7"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1138 …2}
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                    "field_solution_author" => "Gemini 2.5 Pro"
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                    "id" => 5120
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                    0 => "*"
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              ]
              #escapeWhenCastingToString: false
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            "task" => array:2 [
              "refs" => "744886"
              "type" => "task"
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            "text" => "<p>Объем призмы вычисляется по формуле $V = S_{\text{осн}} \cdot H$, где $S_{\text{осн}}$ — площадь основания, а $H$ — высота призмы.</p><p><strong>1. Найдем площадь основания.</strong></p><p>Основанием призмы является равносторонний треугольник $ABC$ со стороной $m$. Площадь равностороннего треугольника со стороной $a$ вычисляется по формуле $S = \frac{a^2 \sqrt{3}}{4}$.</p><p>Для нашего случая, сторона равна $m$, поэтому площадь основания:</p><p>$S_{\text{осн}} = S_{ABC} = \frac{m^2 \sqrt{3}}{4}$</p><p><strong>2. Найдем высоту призмы.</strong></p><p>По условию, вершина $A_1$ верхнего основания проектируется в центр $O$ нижнего основания $ABC$. Это означает, что высота призмы $H$ равна длине отрезка $A_1O$, который перпендикулярен плоскости основания.</p><p>Боковое ребро $AA_1$ составляет с плоскостью основания угол $\varphi$. По определению, угол между прямой и плоскостью — это угол между этой прямой и ее проекцией на плоскость. Проекцией ребра $AA_1$ на плоскость основания является отрезок $AO$. Следовательно, $\angle A_1AO = \varphi$.</p><p>Рассмотрим прямоугольный треугольник $\triangle A_1OA$, где $\angle A_1OA = 90^\circ$. В этом треугольнике:</p><ul><li> $A_1O = H$ — высота призмы (противолежащий катет). </li> <li> $AO$ — проекция ребра $AA_1$ на основание (прилежащий катет). </li></ul><p>Точка $O$ является центром равностороннего треугольника $ABC$. Расстояние от вершины равностороннего треугольника до его центра равно радиусу описанной около него окружности ($R$). Для равностороннего треугольника со стороной $m$ радиус описанной окружности вычисляется по формуле $R = \frac{m}{\sqrt{3}}$.</p><p>Таким образом, $AO = R = \frac{m}{\sqrt{3}}$.</p><p>Теперь из прямоугольного треугольника $\triangle A_1OA$ можем найти высоту $H$:</p><p>$\tan(\varphi) = \frac{A_1O}{AO} = \frac{H}{AO}$</p><p>Отсюда $H = AO \cdot \tan(\varphi) = \frac{m}{\sqrt{3}} \tan(\varphi)$.</p><p><strong>3. Найдем объем призмы.</strong></p><p>Подставим найденные значения площади основания $S_{\text{осн}}$ и высоты $H$ в формулу объема:</p><p>$V = S_{\text{осн}} \cdot H = \left(\frac{m^2 \sqrt{3}}{4}\right) \cdot \left(\frac{m}{\sqrt{3}} \tan(\varphi)\right)$</p><p>Сокращаем $\sqrt{3}$ в числителе и знаменателе:</p><p>$V = \frac{m^2 \cdot m \cdot \tan(\varphi)}{4} = \frac{m^3}{4} \tan(\varphi)$</p><p>Ответ: $V = \frac{m^3}{4} \tan(\varphi)$.</p>"
          ]
          #original: array:6 [
            "id" => 1352199
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1144}
            "task" => array:2 [
              "refs" => "744886"
              "type" => "task"
            ]
            "text" => "<p>Объем призмы вычисляется по формуле $V = S_{\text{осн}} \cdot H$, где $S_{\text{осн}}$ — площадь основания, а $H$ — высота призмы.</p><p><strong>1. Найдем площадь основания.</strong></p><p>Основанием призмы является равносторонний треугольник $ABC$ со стороной $m$. Площадь равностороннего треугольника со стороной $a$ вычисляется по формуле $S = \frac{a^2 \sqrt{3}}{4}$.</p><p>Для нашего случая, сторона равна $m$, поэтому площадь основания:</p><p>$S_{\text{осн}} = S_{ABC} = \frac{m^2 \sqrt{3}}{4}$</p><p><strong>2. Найдем высоту призмы.</strong></p><p>По условию, вершина $A_1$ верхнего основания проектируется в центр $O$ нижнего основания $ABC$. Это означает, что высота призмы $H$ равна длине отрезка $A_1O$, который перпендикулярен плоскости основания.</p><p>Боковое ребро $AA_1$ составляет с плоскостью основания угол $\varphi$. По определению, угол между прямой и плоскостью — это угол между этой прямой и ее проекцией на плоскость. Проекцией ребра $AA_1$ на плоскость основания является отрезок $AO$. Следовательно, $\angle A_1AO = \varphi$.</p><p>Рассмотрим прямоугольный треугольник $\triangle A_1OA$, где $\angle A_1OA = 90^\circ$. В этом треугольнике:</p><ul><li> $A_1O = H$ — высота призмы (противолежащий катет). </li> <li> $AO$ — проекция ребра $AA_1$ на основание (прилежащий катет). </li></ul><p>Точка $O$ является центром равностороннего треугольника $ABC$. Расстояние от вершины равностороннего треугольника до его центра равно радиусу описанной около него окружности ($R$). Для равностороннего треугольника со стороной $m$ радиус описанной окружности вычисляется по формуле $R = \frac{m}{\sqrt{3}}$.</p><p>Таким образом, $AO = R = \frac{m}{\sqrt{3}}$.</p><p>Теперь из прямоугольного треугольника $\triangle A_1OA$ можем найти высоту $H$:</p><p>$\tan(\varphi) = \frac{A_1O}{AO} = \frac{H}{AO}$</p><p>Отсюда $H = AO \cdot \tan(\varphi) = \frac{m}{\sqrt{3}} \tan(\varphi)$.</p><p><strong>3. Найдем объем призмы.</strong></p><p>Подставим найденные значения площади основания $S_{\text{осн}}$ и высоты $H$ в формулу объема:</p><p>$V = S_{\text{осн}} \cdot H = \left(\frac{m^2 \sqrt{3}}{4}\right) \cdot \left(\frac{m}{\sqrt{3}} \tan(\varphi)\right)$</p><p>Сокращаем $\sqrt{3}$ в числителе и знаменателе:</p><p>$V = \frac{m^2 \cdot m \cdot \tan(\varphi)}{4} = \frac{m^3}{4} \tan(\varphi)$</p><p>Ответ: $V = \frac{m^3}{4} \tan(\varphi)$.</p>"
          ]
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    "book" => Illuminate\Database\Eloquent\Collection {#1110
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    "page" => Illuminate\Database\Eloquent\Collection {#1116
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        0 => App\Models\BookPage {#1113
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            "created_at" => "2026-04-10 13:58:26"
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            "field_page_start" => "130"
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                  #connection: "mysql"
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                    "id" => 1108176
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "edition" => Illuminate\Database\Eloquent\Collection {#1153 …2}
                    "book_page" => array:2 [ …2]
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                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "edition" => Illuminate\Database\Eloquent\Collection {#1153 …2}
                    "book_page" => array:2 [ …2]
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                  +exists: true
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                  #escapeWhenCastingToString: false
                  #attributes: array:24 [
                    "id" => 744881
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_page_start" => "130"
                    "field_page_end" => null
                    "field_url" => "/10-klass/geometrija/atanasjan-uchebnik/00-466"
                    "field_display_title" => "466"
                    "field_outside_task" => null
                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1259 …2}
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                    "breadcrumbs" => []
                    "edition_groups" => Illuminate\Database\Eloquent\Collection {#1260 …2}
                    "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1261 …2}
                    "parent_branches" => Illuminate\Database\Eloquent\Collection {#1262 …2}
                    "content" => Illuminate\Database\Eloquent\Collection {#1265 …2}
                    "next" => array:2 [ …2]
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                    "book" => Illuminate\Database\Eloquent\Collection {#1274 …2}
                    "page" => array:2 [ …2]
                  ]
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                    "updated_at" => null
                    "field_page_start" => "130"
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                    "field_display_title" => "466"
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                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1259 …2}
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                     …13
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                  #guarded: array:1 [ …1]
                }
                1 => App\Models\Task {#1264
                  #connection: "mysql"
                  #table: "tasks"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
                  #with: []
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№471 (с. 130)
Условие. №471 (с. 130)
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 130, номер 471, Условие

471. Основанием призмы ABCA₁B₁C₁ является равносторонний треугольник ABC со стороной m. Вершина А₁ проектируется в центр этого основания, а ребро АА₁ составляет с плоскостью основания угол φ. Найдите объём призмы.

Решение 2. №471 (с. 130)
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 130, номер 471, Решение 2
Решение 3. №471 (с. 130)
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 130, номер 471, 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 130, номер 471, Решение 3 (продолжение 2)
Решение 4. №471 (с. 130)
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 130, номер 471, Решение 4
Решение 6. №471 (с. 130)

Объем призмы вычисляется по формуле $V = S_{\text{осн}} \cdot H$, где $S_{\text{осн}}$ — площадь основания, а $H$ — высота призмы.

1. Найдем площадь основания.

Основанием призмы является равносторонний треугольник $ABC$ со стороной $m$. Площадь равностороннего треугольника со стороной $a$ вычисляется по формуле $S = \frac{a^2 \sqrt{3}}{4}$.

Для нашего случая, сторона равна $m$, поэтому площадь основания:

$S_{\text{осн}} = S_{ABC} = \frac{m^2 \sqrt{3}}{4}$

2. Найдем высоту призмы.

По условию, вершина $A_1$ верхнего основания проектируется в центр $O$ нижнего основания $ABC$. Это означает, что высота призмы $H$ равна длине отрезка $A_1O$, который перпендикулярен плоскости основания.

Боковое ребро $AA_1$ составляет с плоскостью основания угол $\varphi$. По определению, угол между прямой и плоскостью — это угол между этой прямой и ее проекцией на плоскость. Проекцией ребра $AA_1$ на плоскость основания является отрезок $AO$. Следовательно, $\angle A_1AO = \varphi$.

Рассмотрим прямоугольный треугольник $\triangle A_1OA$, где $\angle A_1OA = 90^\circ$. В этом треугольнике:

  • $A_1O = H$ — высота призмы (противолежащий катет).
  • $AO$ — проекция ребра $AA_1$ на основание (прилежащий катет).

Точка $O$ является центром равностороннего треугольника $ABC$. Расстояние от вершины равностороннего треугольника до его центра равно радиусу описанной около него окружности ($R$). Для равностороннего треугольника со стороной $m$ радиус описанной окружности вычисляется по формуле $R = \frac{m}{\sqrt{3}}$.

Таким образом, $AO = R = \frac{m}{\sqrt{3}}$.

Теперь из прямоугольного треугольника $\triangle A_1OA$ можем найти высоту $H$:

$\tan(\varphi) = \frac{A_1O}{AO} = \frac{H}{AO}$

Отсюда $H = AO \cdot \tan(\varphi) = \frac{m}{\sqrt{3}} \tan(\varphi)$.

3. Найдем объем призмы.

Подставим найденные значения площади основания $S_{\text{осн}}$ и высоты $H$ в формулу объема:

$V = S_{\text{осн}} \cdot H = \left(\frac{m^2 \sqrt{3}}{4}\right) \cdot \left(\frac{m}{\sqrt{3}} \tan(\varphi)\right)$

Сокращаем $\sqrt{3}$ в числителе и знаменателе:

$V = \frac{m^2 \cdot m \cdot \tan(\varphi)}{4} = \frac{m^3}{4} \tan(\varphi)$

Ответ: $V = \frac{m^3}{4} \tan(\varphi)$.

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Мы подготовили для вас ответ c подробным объяснением домашего задания по геометрии за 10-11 класс, для упражнения номер 471 расположенного на странице 130 к учебнику 2019 года издания для учащихся школ и гимназий.

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