Диагональ ВД = 2*1*cos 30° = 2*1*(√3/2) = √3.
Угол ВД1Д = arc tg(ВД/ДД1) = arg tg(√3/1) = arg tg(√3) = 60°.
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Диагональ ВД = 2*1*cos 30° = 2*1*(√3/2) = √3.
Угол ВД1Д = arc tg(ВД/ДД1) = arg tg(√3/1) = arg tg(√3) = 60°.