July 2022 1 109 Report
Дана правильная треугольная пирамида DABC с вершиной D.
Точка M — середина ребра AB, N — основание перпендикуляра, опущенного из точки M на прямую CD.
Найдите угол между боковыми гранями пирамиды, если угол между боковым ребром и плоскостью основания равен 60◦
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