Предмет: Алгебра, автор: Margooooooooo

Помогите решить!!!
За ранее спасибо!!!

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Автор ответа: Chuzhikh

я нашла в интеренете,площадь ромба=сторона умноженная на высоту
отсюда-5*13=65
но по учебнику геометрии площадь ромба находится по формуле:
S=(d1*d2):2
d1,d2-диагонали

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