#### Answer

radius = 30 ft
diameter = 60 ft

#### Work Step by Step

The circumference of the circle = 60$\pi$ ft
The circumference of the circle is given by the formula
c= $\pi$ d = 2$\pi$ r
therefore 2$\pi$ r = 60$\pi$
2r = 60
r = $\frac{60}{2}$ = 30 ft
Therefore diameter of the circle = 2r = 2* 30 = 60 ft