1. The problem statement, all variables and given/known data The problem is attached in the picture. 3. The attempt at a solution What bothers me is that they say the wedge is bounded by x + z = a. Doesn't this imply that the calculated volume should only be half of what is written in the answers? I'm aware that the plane x + z = a can refer to either the left (negative) side or the right (positive) side. Do we choose one or simply take both? Limits for x: 0 to a Limits for y: 0 to √4ax Limits for z: 0 to a-x However, in http://mathworld.wolfram.com/CylindricalWedge.html the wedge is given as the full volume.