2012 Pascal Problem 22

Two circles with equal radii intersect as shown. The area of the shaded region equals the sum of the areas of the two unshaded regions. If the area of the shaded region is 216\pi, what is the circumference of each circle?

\textbf{(A)}\ 18\pi\quad \textbf{(B)}\ 27\pi\quad \textbf{(C)}\ 36\pi\quad \textbf{(D)}\ 108\pi\quad \textbf{(E)}\ 324\pi

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Pascal contests here.