Предмет: Математика, автор: sabinausubova

общая длина всех ребер куба равна 840 см.Вычисли площадь одной грани куба.Вычисли общую площадь всех граней куба

Ответы

Автор ответа: Kasitsa

У куба 12 равных по длине рёбер, значит, длина одного ребра = 840см/12=70см.
Грань куба - квадрат, сторона которого - ребро куба. Значит, площадь грани=70см*70см=4900кв.см
У куба 6 граней, значит общая площадь всех граней=4900кв.см*6=29400кв.см

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