The Southern African Large Telescope (SALT) is housed in a cylindrical building with a domed roof in the shape of a hemisphere. The height of the
building wall is 20 and the diameter is 12 m. To program the ventilation
system for heat, air conditioning, and dehumidifying, the engineers need the
amount of air in the building. What is the volume of air in the building.
Answer may be in terms of pie.