August 2021 0 19 Report
Равнобедренные треугольники ABC и DBC имеют общее основание BC. Точка D не лежит в плоскости треугольника ABC. Найдите угол между плоскостями треугольников, если BD=DC=26 дм, AB=AC=30 дм, BC=48 дм, AD=2sqrt61 дм
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