Предмет: Математика, автор: vyushkov2004

общая длина всех рёбер куба равна 840см.вычисли площадь одной грани куба.вычисли общую площадь всех граней куба.

Ответы

Автор ответа: uchilka2012

12 ребер у куба
840/12=70 см длина 1 ребра
70*70=4900 см² площадь 1 грани
6 граней у куба
4900*6=29400 см² общая площадь всех граней

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