Question

gente me ajudem por favor

Answer 1

Area do circulo :
===============
A = pi x r^2
9pi = pi x r^2
vamos cortar o pi ficaram assom:
9 = r^2
r^2 = 9
r = \/9
r = 3cm


Formula do volume :
==================
dados :
>>>>>>>
r = 3cm
pi = 3,14

Volume :
>>>>>>>>
Vol. = 4 x pi x r^3
............_________
.....................3

Vol = 4 x 3,14 x (3)^3
..........____________
.....................3

Vol. = 12,56 x 27
..........._________
.....................3

Vol. = 339,12
............______
...................3

Vol. = 1130,04 cm^3