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№89.1
Author:
liudmylas
Отрезок АМ перпендикулярен плокости прямоугольника АВСD. Угол между прмой МС и этой плоскостью равен 30 градусов. АD=sqrt(2), CD=2. 1. Найдите АМ. 2. Найдите двугранный угол МСDА
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