Предмет: Геометрия, автор: aselka96

ABCDA1B1C1D1-куб.Найдите угол между прямыми BB1 и AD1

Ответы

Автор ответа: Dupel

AD1=BC1.совмещаем в общей точке B.тогда BC1-диагональ квадрата,значит углы делит пополам.

угол=45 $^o$

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