Предмет: Математика, автор: амирка1

периметр треугольника 28 см и второй сторон 9 см и 7 см.

Ответы

Автор ответа: xxMeow

1)Решение :
1) 9 + 7 = 16 (см) - 1 + 2 сторона
2) 28 - 16 = 12 (см) - длина 3 стороны
Ответ : 3 сторона = 12 см

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