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Вариант 2(Задача 1) (К/р "Угол между прямой и плоскостью)
1. В треугольнике АВС АС=ВС= m, угол АСВ=120 градусов; РА перпендикулярен АВС . Точка Р удалена на расстояние, равное m, от прямой ВС. Найдите расстояние от точки Р до плоскости АВС.