(geometry) what is the circumference of the circle below in terms of pi?

a) 1.1 pi
b) 1.21 pi
c) 2.2 pi
d) 4.4 pi
e) 1.12 pi

I would think D because the formula for the circumference of a circle is 2*Pi*R, so using 2*R*Pi, due to the commutative property of multiplication it can be rearranged, therefore 2 times the radius, 2.2, equals 4.4, times pi, so D

Yourself by using the internet

If you make it a little more clear i can answer it