Предмет: Геометрия, автор: KateGrint

в равнобедренном треугольнике abc через вершины основания c и b и точку n, которая является серединой высоты, проведённой к основанию, проведены прямые cd и be (d принадлежит ab, e принадлежит ac). Найдите площадь треугольника abc, если площадь четырёхугольника aend равна 3

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Автор ответа: Zhiraffe

Малость в ночи обсчитался. Ответ будет 18. Чертеж и решение в файлах. Будут вопросы, спрашивайте ))

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