Excuse me for my English, I'm Dutch)    

I have a excersice I have to make in Maple, but i don't have a clue on how to do it. I will just type it here and see what the response is.

If somebody has the Calculus book written by James Stewart, it's the "Discovery Project" on page 1040..

The figure shows the solid enclosed by three circular cylinders with the same diameter that intersect at right angles/ In this project we compute its volume and determine how its shape changes if the cylinders have different diameters.