Question

срочно срочно помагите​

Answer 1

Формулы: S = $\pi$$r^{2}$; S = ( $\pi$$D^{2}$)/4

$\pi$ = 3,14

1) S = 3,14 * $2^{2}$ = 12, 56 см^2

2) S = 3,14 * $2,5^{2}$ = 19,625 см^2

3) (3,14 * $8^{2}$)/4 = 50, 24 см^2