#### Answer

r=$\frac{C}{2\pi}$
Circumference formula

#### Work Step by Step

C=2$\pi$r
2$\pi$r=C
$\frac{2\pi r}{2\pi}$=$\frac{C}{2\pi}$
r=$\frac{C}{2\pi}$
The given is the circumference formula which means that circumference is equal to the product of 2, pi, and the radius.