2012 Cayley Problem 15

In the diagram, each of the two circles has centre O. Also, OP : PQ = 1 : 2. If the radius of the larger circle is 9, what is the area of the shaded region?

\textbf{(A)}\ 12\pi\quad \textbf{(B)}\ 36\pi\quad \textbf{(C)}\ 54\pi\quad \textbf{(D)}\ 72\pi\quad \textbf{(E)}\ 81\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 Cayley contests here.