Question: Plotting solids in space

I have an exam in vector analysis soon, and it happens quite often we're supposed to parametrize the surface of as solid. Is there a way to get maple to plot the solid so it's simpler to visualize the current situation? Suppose for example that E is the solid defined by x^2+y^2+z^2=<>a^2 with a some constant and =<> means greater than or equal to. Suppose S is the boundary-surface of E. How do I plot S in the easiest way? It's for use for an exam so time is precious.
Please Wait...