November 2021 0 17 Report
В прямоугольном параллелепипеде ABCDA1B1C1D1 основание ABCD – ромб со стороной 6 см и углом A = 60º. Высота параллелепипеда 9 см. Найдите угол между плоскостью BC1D и плоскостью основания.
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