Предмет: Геометрия, автор: kamillapochta

Геометрия, 10 класс
Желательно с обьяснениес, но можно и без

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Ответы

Автор ответа: natalyabryukhova
1

Слева на плоскости поставим точку С, т.е. BC⊥α, справа точку Д, т.е. АД⊥α.

ΔОАД и ΔВСО - прямоугольные.

АД/ОА=sinФ, АД=ОА*sinФ=asinФ

BC/BO=sinФ, BC=BO*sinФ=bsinФ

1)


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