1. The problem statement, all variables and given/known data Use cylindrical coordinates to find the volume of the solid. The solid is enclosed by the paraboloid z=x2+y2 and the plane z=9 2. Relevant equations z=r2 3. The attempt at a solution So I'm getting close to the answer but not quite, and I keep getting a negative which doesn't make sense. And I think my limit on the second integration needs to be a function of theta. I chose z=9 as my z upper limit and z=r2 as my lower and just used rdzdrd(theta) as my integrand. Used 0 for lower limit for both dr and dtheta and started to use sqrt(9/2) as my upper limits for both dr and d(theta) but then changed d(theta's) upper limit to 2pi. I need help lol. BTW.. My notation on this is sloppy. I originally started with the z limits reversed but changed it once I integrated.. sorry.