July 2022 1 12 Report
Треугольник A1B1C1 является ортогональной проекцией ∆ABC на плоскость α. Найдите косинус двугранного угла между плоскостям ABC и α , если AA1=BB1=3 см, CC1=8 см, A1B1=13 см, A1C1=C1B1=12 см​
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