You know the circumference. You want to find the radius.
This is using the reverse circumference formula!
CIRCUMFERENCE OF A CIRCLE:
\(2 \pi r\) = circumference
Now plug in. \(2 \pi r = 72 \pi\)
Simplify and isolate r.
\(2r=72\)
\(r=36\)
the radius is 36.
