Area=pi times radius^2 area=36pi 36pi=pi times radius^2 divide both sides by pi 36=radius^2 square root both sides 6=radius
2radius=diameter 2 times 6=12 radius=6 diamater=12
the answers area A and D (if you know your radius and diameter, you would know that diameter is 2 times radius and you could eliminate 2 choices imedietly (B and C))
