Question

A Circle has a Radius of 2.5 cm. Find it's circumference.

Answer 1

 C = 2(pi)(r)
pi = 3.14
r = 2.5

C = 2(3.14)(2.5)
C = 15.7 <==....or 5(pi)

Answer 2

C=2πr=2·π·2.5≈15.70796