Geometry Proof - Thanks for any help!

A - In a chemistry lab you use a funnel to filter a liquid. The diameter of the funnel is 12 cm and its height is 12 cm. How much liquid will the funnel hold when it is full?

B - The funnel has a filter that was being used to remove impurities from the solution but it became clogged and stopped draining. The height of the remaining solution is 4 cm and the radius of the surface of the solution is 2 cm. How many cubic centimeters of the solution remain in the funnel?