Предмет: Геометрия, автор: Никитчет

Тема "Перпендикуляр и наклонные. Угол между прямой и плоскостью". Задача В1

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Автор ответа: Ivanna2013

0

найдем высоту треугольника ВК по теореме Пифагора

$sqrt{25^2-(frac{48}{2})^2}=sqrt{625-576}=7$

из треугольника DBK по теореме Пифагора найдем DK

$sqrt{15+49}=8$

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