April 2022 0 1 Report
. В треугольной пирамиде PABC с вершиной Р боковые ребра попарно перпендикулярны, PA = 9 см, PB = 12 см, PC = 20 см.
Найдите тангенс двугранного угла, образованного плоскостями
PAB и ABC.
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