ЛУЧШАЯ ЗАДАЧА ДЛЯ ЛЮБИТЕЛЕЙ ГЕОМЕТРИИ. Треугольник в прямоугольнике.
М и К - сердины сторон пр-ка ABCD, точка N лежит на диагонали. Площадь тр-ка ANK равна 1. Найти площзадь пр-ка.
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