August 2022 1 47 Report
Дана правильная треугольная призма ABCA1B1C1 с основаниями ABC и A1B1C1. Скрещивающиеся диагонали BA1 и CB1 боковых граней AA1B1B и BB1C1C перпендикулярны.
Найдите угол между прямой BA1 и плоскостью BCC1.
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