Respuesta :

jjonathon7
circumference = pi x diameter
diameter = 9
 circumference = 9pi or 9 x 3.14
area = pi x radius ^2 
radius =1/2 diameter
radius=4.5
pi x 4.5 ^2 
4.5 x 4.5 = 20.25
20.25 x 3.14 
area = 64 circumference =28