Предмет: Математика, автор: vitalinazharki

Найди площадь кpуга, pадиус котоpого pавен 8 см. Число π(пи)окpугли до десятых.

Ответы

Автор ответа: mesteron98

пи =3,14 ..., округляя до десятых получаем пи= 3,1
площадь круга S= пи * R*R , где R - радиус круга
тогда получаем S= 3.1*8*8=198.4 см^2

Автор ответа: vitalinazharki

Почему пи умножаем на R два раза?

Автор ответа: mesteron98

потому что формула такая)

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