Предмет: Математика, автор: balakinad

Найдите площадь круга, у которого диаметр равен 12 см.Найдите площадь круга , у которого диаметр в 2 раза меньше диаметра первого круга

Ответы

Автор ответа: s1936635

1)радиус=1/2d=12/2=6
площадь круга 6^2*3.14=113.04
2)диаметр 12/2=6
радиус=1/2d=6/2=3
площадь круга 3^2*3.14=28,26

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