Geometry proof - for any !

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?