Respuesta :

jcherry99

Answer:

Step-by-step explanation:

C = 2*pi * r

r = 9 cm

pi = 3.14

C = 2*3.14 * 9

C = 56.52

Edit

You wanted it in terms of pi

C = 2 pi r

r = 9

C = 2*9*pi

C = 18 * pi