Предмет: Геометрия, автор: daniya88

Высоты параллелограмма равны 5 см и 4 см, а периметр равен 42 см. Найдите площадь параллелограмма.

Ответы

Автор ответа: elenastepanova3
127
Пусть одна сторона параллелограмма х см, тогда вторая (21-х) см. Площадь 5х см^2 или 4(21-х) см^2.
Уравнение:
5х = 4(21-х)
х=28/3
Площадь 5*28/3=46целых2/3 (см)
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