Circumference=2piradius Using that, you need to find the radius (which is one half of the diameter) 72/2=36 That is when you can plug the radius in: Circumference=2pi36 2*36=72. 72*pi is 72pi, or if you want to use 3.14, 72*3.14=226.08 Log in to Reply

Circumference=2piradius

Using that, you need to find the radius (which is one half of the diameter) 72/2=36

That is when you can plug the radius in: Circumference=2pi36

2*36=72. 72*pi is 72pi, or if you want to use 3.14, 72*3.14=226.08