Номер 484, страница 132 - 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 484, страница 132.

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                          ]
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                    }
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                        0 => App\Models\Term {#1049
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                        0 => App\Models\Term {#1053
                          #connection: "mysql"
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                        0 => App\Models\Term {#1057
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                        0 => App\Models\Term {#1059
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                          #table: "terms"
                          #primaryKey: "id"
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                            "field_cases" => array:6 [ …6]
                            "field_color" => null
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                        0 => App\Models\Term {#1061
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                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1062
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                    }
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                    "field_part" => ""
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                    "field_link_to_source" => null
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                    ]
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                    }
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                    }
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                    }
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                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1066
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                        0 => App\Models\Term {#1067
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1034}
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                    ]
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1068
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          ]
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            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#333}
            "field_page_start" => "116"
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            "field_branch_covers" => []
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      ]
      #escapeWhenCastingToString: false
    }
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      #items: array:2 [
        0 => App\Models\Branch {#1023}
        1 => App\Models\Branch {#1070
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          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
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          #perPage: 15
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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"
            "field_branch_order" => "3"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1071
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                0 => App\Models\Term {#1072
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                  #attributes: array:7 [
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                    "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" => "§"
                  ]
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                    "name" => "Параграф"
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                }
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            "book" => Illuminate\Database\Eloquent\Collection {#1073
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                0 => App\Models\Branch {#1075
                  #connection: "mysql"
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1076 …2}
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        0 => App\Models\Element {#1080
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            "id" => 939133
            "created_at" => "2026-04-10 13:58:26"
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            "edition" => Illuminate\Database\Eloquent\Collection {#1081
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                  #connection: "mysql"
                  #table: "editions"
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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 {#1083 …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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                    "field_edition_type" => "statement"
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                    "title" => "Условие"
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                  ]
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            "task" => array:2 [
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            "text" => "<p> <b>484.</b> Основание пирамиды — равнобедренный треугольник ABC, в котором <span class="long"> AB = ВС = 13 см,</span> <span class="long">АС = 10 см. </span> Каждое боковое ребро пирамиды образует с её высотой угол в 30°. Вычислите объём пирамиды. </p>"
            "img" => array:1 [
              0 => array:5 [
                "name" => "484-1.jpg"
                "alt" => null
                "width" => "1535"
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            "id" => 939133
            "created_at" => "2026-04-10 13:58:26"
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            "edition" => Illuminate\Database\Eloquent\Collection {#1081}
            "task" => array:2 [
              "refs" => "744899"
              "type" => "task"
            ]
            "text" => "<p> <b>484.</b> Основание пирамиды — равнобедренный треугольник ABC, в котором <span class="long"> AB = ВС = 13 см,</span> <span class="long">АС = 10 см. </span> Каждое боковое ребро пирамиды образует с её высотой угол в 30°. Вычислите объём пирамиды. </p>"
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              0 => array:5 [
                "name" => "484-1.jpg"
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            0 => "*"
          ]
        }
        1 => App\Models\Element {#1088
          #connection: "mysql"
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          #attributes: array:6 [
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            "created_at" => "2026-04-10 13:58:26"
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            "edition" => Illuminate\Database\Eloquent\Collection {#1089
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                0 => App\Models\Edition {#1090
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                  #keyType: "int"
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                  #attributes: array:21 [
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                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Решение 2"
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                    "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1095 …2}
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                    "updated_at" => null
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                    "field_page_content_text_checked" => "0"
                    "field_solution_author" => "Неизвестный"
                    "field_moderator" => "pasha"
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                    "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1095 …2}
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                  ]
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                    0 => "*"
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              ]
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            }
            "task" => array:2 [
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              0 => array:5 [
                "name" => "484-1.png"
                "alt" => null
                "width" => "694"
                "height" => 4776
                "path" => "/media/geometrija_10/atanasjan-u23/2-00/484-1.webp?ts=1739441350"
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          ]
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            "edition" => Illuminate\Database\Eloquent\Collection {#1089}
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                "name" => "484-1.png"
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                "width" => "694"
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            0 => "*"
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        }
        2 => App\Models\Element {#1096
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          #table: "elements"
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            "created_at" => "2026-04-10 13:58:26"
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                0 => App\Models\Edition {#1098
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                  #attributes: array:21 [
                    "id" => 2318
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Решение 3"
                    "field_order" => "4"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1099 …2}
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                    "field_page_content_text_checked" => "0"
                    "field_solution_author" => "Неизвестный"
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                    "field_edition_type" => "solution"
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                    "id" => 2318
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                  ]
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                    0 => "*"
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                "width" => "1406"
                "height" => 519
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                "height" => 795
                "path" => "/media/geometrija_10/atanasjan-u23/3-00/484-2.webp?ts=1739436956"
              ]
            ]
          ]
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            "id" => 941869
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              "refs" => "744899"
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                "width" => "1406"
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                "path" => "/media/geometrija_10/atanasjan-u23/3-00/484-1.webp?ts=1739436956"
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                "name" => "484-2.jpg"
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                "height" => 795
                "path" => "/media/geometrija_10/atanasjan-u23/3-00/484-2.webp?ts=1739436956"
              ]
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        3 => App\Models\Element {#1104
          #connection: "mysql"
          #table: "elements"
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          #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 {#1106
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                  #table: "editions"
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            "text" => "<p><strong>1. Нахождение площади основания пирамиды</strong></p><p>Основанием пирамиды является равнобедренный треугольник $ABC$ со сторонами $AB = BC = 13$ см и основанием $AC = 10$ см. Для вычисления его площади $S_{осн}$ проведем высоту $BH$ к стороне $AC$. В равнобедренном треугольнике эта высота также является медианой, поэтому она делит основание $AC$ пополам: $AH = HC = \frac{10}{2} = 5$ см.</p><p>Из прямоугольного треугольника $BHC$ по теореме Пифагора найдем длину высоты $BH$:</p><p>$BH = \sqrt{BC^2 - HC^2} = \sqrt{13^2 - 5^2} = \sqrt{169 - 25} = \sqrt{144} = 12$ см.</p><p>Площадь основания пирамиды равна площади треугольника $ABC$:</p><p>$S_{осн} = \frac{1}{2} \cdot AC \cdot BH = \frac{1}{2} \cdot 10 \cdot 12 = 60$ см<sup>2</sup>.</p><p><strong>2. Нахождение высоты пирамиды</strong></p><p>Пусть $SO$ — высота пирамиды $H$. По условию, каждое боковое ребро образует с высотой угол $30^\circ$. Это означает, что если мы рассмотрим прямоугольные треугольники, образованные высотой $SO$ и боковыми ребрами ($SA, SB, SC$), то углы $\angle ASO, \angle BSO, \angle CSO$ будут равны $30^\circ$.</p><p>Так как треугольники $\triangle SOA, \triangle SOB, \triangle SOC$ являются прямоугольными (с прямым углом при вершине $O$), имеют общий катет $SO$ и равный острый угол ($30^\circ$), они равны по катету и острому углу. Из равенства этих треугольников следует, что их вторые катеты также равны: $OA = OB = OC$. Это означает, что точка $O$ является центром окружности, описанной около треугольника $ABC$, а отрезки $OA, OB, OC$ — ее радиусом $R$.</p><p>Найдем радиус $R$ описанной окружности по формуле $R = \frac{abc}{4S}$, где $a,b,c$ — стороны треугольника:</p><p>$R = \frac{13 \cdot 13 \cdot 10}{4 \cdot S_{осн}} = \frac{1690}{4 \cdot 60} = \frac{1690}{240} = \frac{169}{24}$ см.</p><p>Теперь из прямоугольного треугольника $SOA$ найдем высоту пирамиды $H=SO$. В этом треугольнике нам известен катет $OA=R$ и прилежащий к высоте $SO$ угол $\angle ASO = 30^\circ$.</p><p>Используя определение тангенса, получаем: $\tan(\angle ASO) = \frac{OA}{SO}$.</p><p>Отсюда выражаем высоту $H=SO$:</p><p>$H = SO = \frac{OA}{\tan(30^\circ)} = \frac{R}{1/\sqrt{3}} = R\sqrt{3} = \frac{169}{24} \cdot \sqrt{3} = \frac{169\sqrt{3}}{24}$ см.</p><p><strong>3. Вычисление объёма пирамиды</strong></p><p>Объём пирамиды $V$ вычисляется по формуле $V = \frac{1}{3}S_{осн} \cdot H$. Подставим найденные значения площади основания и высоты:</p><p>$V = \frac{1}{3} \cdot 60 \cdot \frac{169\sqrt{3}}{24} = 20 \cdot \frac{169\sqrt{3}}{24}$</p><p>Сократим и вычислим окончательное значение:</p><p>$V = \frac{20 \cdot 169\sqrt{3}}{24} = \frac{5 \cdot 169\sqrt{3}}{6} = \frac{845\sqrt{3}}{6}$ см<sup>3</sup>.</p><p><strong>Ответ:</strong> $V = \frac{845\sqrt{3}}{6}$ см<sup>3</sup>.</p>"
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            "text" => "<p><strong>1. Нахождение площади основания пирамиды</strong></p><p>Основанием пирамиды является равнобедренный треугольник $ABC$ со сторонами $AB = BC = 13$ см и основанием $AC = 10$ см. Для вычисления его площади $S_{осн}$ проведем высоту $BH$ к стороне $AC$. В равнобедренном треугольнике эта высота также является медианой, поэтому она делит основание $AC$ пополам: $AH = HC = \frac{10}{2} = 5$ см.</p><p>Из прямоугольного треугольника $BHC$ по теореме Пифагора найдем длину высоты $BH$:</p><p>$BH = \sqrt{BC^2 - HC^2} = \sqrt{13^2 - 5^2} = \sqrt{169 - 25} = \sqrt{144} = 12$ см.</p><p>Площадь основания пирамиды равна площади треугольника $ABC$:</p><p>$S_{осн} = \frac{1}{2} \cdot AC \cdot BH = \frac{1}{2} \cdot 10 \cdot 12 = 60$ см<sup>2</sup>.</p><p><strong>2. Нахождение высоты пирамиды</strong></p><p>Пусть $SO$ — высота пирамиды $H$. По условию, каждое боковое ребро образует с высотой угол $30^\circ$. Это означает, что если мы рассмотрим прямоугольные треугольники, образованные высотой $SO$ и боковыми ребрами ($SA, SB, SC$), то углы $\angle ASO, \angle BSO, \angle CSO$ будут равны $30^\circ$.</p><p>Так как треугольники $\triangle SOA, \triangle SOB, \triangle SOC$ являются прямоугольными (с прямым углом при вершине $O$), имеют общий катет $SO$ и равный острый угол ($30^\circ$), они равны по катету и острому углу. Из равенства этих треугольников следует, что их вторые катеты также равны: $OA = OB = OC$. Это означает, что точка $O$ является центром окружности, описанной около треугольника $ABC$, а отрезки $OA, OB, OC$ — ее радиусом $R$.</p><p>Найдем радиус $R$ описанной окружности по формуле $R = \frac{abc}{4S}$, где $a,b,c$ — стороны треугольника:</p><p>$R = \frac{13 \cdot 13 \cdot 10}{4 \cdot S_{осн}} = \frac{1690}{4 \cdot 60} = \frac{1690}{240} = \frac{169}{24}$ см.</p><p>Теперь из прямоугольного треугольника $SOA$ найдем высоту пирамиды $H=SO$. В этом треугольнике нам известен катет $OA=R$ и прилежащий к высоте $SO$ угол $\angle ASO = 30^\circ$.</p><p>Используя определение тангенса, получаем: $\tan(\angle ASO) = \frac{OA}{SO}$.</p><p>Отсюда выражаем высоту $H=SO$:</p><p>$H = SO = \frac{OA}{\tan(30^\circ)} = \frac{R}{1/\sqrt{3}} = R\sqrt{3} = \frac{169}{24} \cdot \sqrt{3} = \frac{169\sqrt{3}}{24}$ см.</p><p><strong>3. Вычисление объёма пирамиды</strong></p><p>Объём пирамиды $V$ вычисляется по формуле $V = \frac{1}{3}S_{осн} \cdot H$. Подставим найденные значения площади основания и высоты:</p><p>$V = \frac{1}{3} \cdot 60 \cdot \frac{169\sqrt{3}}{24} = 20 \cdot \frac{169\sqrt{3}}{24}$</p><p>Сократим и вычислим окончательное значение:</p><p>$V = \frac{20 \cdot 169\sqrt{3}}{24} = \frac{5 \cdot 169\sqrt{3}}{6} = \frac{845\sqrt{3}}{6}$ см<sup>3</sup>.</p><p><strong>Ответ:</strong> $V = \frac{845\sqrt{3}}{6}$ см<sup>3</sup>.</p>"
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№484 (с. 132)
Условие. №484 (с. 132)
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 132, номер 484, Условие

484. Основание пирамиды — равнобедренный треугольник ABC, в котором AB = ВС = 13 см, АС = 10 см. Каждое боковое ребро пирамиды образует с её высотой угол в 30°. Вычислите объём пирамиды.

Решение 2. №484 (с. 132)
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 132, номер 484, Решение 2
Решение 3. №484 (с. 132)
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 132, номер 484, 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 132, номер 484, Решение 3 (продолжение 2)
Решение 6. №484 (с. 132)

1. Нахождение площади основания пирамиды

Основанием пирамиды является равнобедренный треугольник $ABC$ со сторонами $AB = BC = 13$ см и основанием $AC = 10$ см. Для вычисления его площади $S_{осн}$ проведем высоту $BH$ к стороне $AC$. В равнобедренном треугольнике эта высота также является медианой, поэтому она делит основание $AC$ пополам: $AH = HC = \frac{10}{2} = 5$ см.

Из прямоугольного треугольника $BHC$ по теореме Пифагора найдем длину высоты $BH$:

$BH = \sqrt{BC^2 - HC^2} = \sqrt{13^2 - 5^2} = \sqrt{169 - 25} = \sqrt{144} = 12$ см.

Площадь основания пирамиды равна площади треугольника $ABC$:

$S_{осн} = \frac{1}{2} \cdot AC \cdot BH = \frac{1}{2} \cdot 10 \cdot 12 = 60$ см2.

2. Нахождение высоты пирамиды

Пусть $SO$ — высота пирамиды $H$. По условию, каждое боковое ребро образует с высотой угол $30^\circ$. Это означает, что если мы рассмотрим прямоугольные треугольники, образованные высотой $SO$ и боковыми ребрами ($SA, SB, SC$), то углы $\angle ASO, \angle BSO, \angle CSO$ будут равны $30^\circ$.

Так как треугольники $\triangle SOA, \triangle SOB, \triangle SOC$ являются прямоугольными (с прямым углом при вершине $O$), имеют общий катет $SO$ и равный острый угол ($30^\circ$), они равны по катету и острому углу. Из равенства этих треугольников следует, что их вторые катеты также равны: $OA = OB = OC$. Это означает, что точка $O$ является центром окружности, описанной около треугольника $ABC$, а отрезки $OA, OB, OC$ — ее радиусом $R$.

Найдем радиус $R$ описанной окружности по формуле $R = \frac{abc}{4S}$, где $a,b,c$ — стороны треугольника:

$R = \frac{13 \cdot 13 \cdot 10}{4 \cdot S_{осн}} = \frac{1690}{4 \cdot 60} = \frac{1690}{240} = \frac{169}{24}$ см.

Теперь из прямоугольного треугольника $SOA$ найдем высоту пирамиды $H=SO$. В этом треугольнике нам известен катет $OA=R$ и прилежащий к высоте $SO$ угол $\angle ASO = 30^\circ$.

Используя определение тангенса, получаем: $\tan(\angle ASO) = \frac{OA}{SO}$.

Отсюда выражаем высоту $H=SO$:

$H = SO = \frac{OA}{\tan(30^\circ)} = \frac{R}{1/\sqrt{3}} = R\sqrt{3} = \frac{169}{24} \cdot \sqrt{3} = \frac{169\sqrt{3}}{24}$ см.

3. Вычисление объёма пирамиды

Объём пирамиды $V$ вычисляется по формуле $V = \frac{1}{3}S_{осн} \cdot H$. Подставим найденные значения площади основания и высоты:

$V = \frac{1}{3} \cdot 60 \cdot \frac{169\sqrt{3}}{24} = 20 \cdot \frac{169\sqrt{3}}{24}$

Сократим и вычислим окончательное значение:

$V = \frac{20 \cdot 169\sqrt{3}}{24} = \frac{5 \cdot 169\sqrt{3}}{6} = \frac{845\sqrt{3}}{6}$ см3.

Ответ: $V = \frac{845\sqrt{3}}{6}$ см3.

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