Предмет: Математика, автор: Dikosh16

3.Диаметр круга равен 16,2см.Найдите площадь круга, если его радиус
уменьшить на 1,5см.​

Ответы

Автор ответа: iramazurk
1

Ответ:

Пошаговое объяснение:

D = 16,2 см; D = 2R; R = 16,2 : 2 = 8,1 см

Уменьшим радиус на 1,5 см :

8,1 - 1,5 =6,6 см; R = 6,6 см

Сейчас найдём S круга:

S = П * R^2

S = 3,14 * 6,6^2 = 3,14 * 43,56 = 136,7784 = 136,8 см2

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