Homework Help: Triple integral to find Volume of Solid

1. Sep 12, 2010

yyh1

1. The problem statement, all variables and given/known data
Use a triple integral to find the volume of solid enclosed between the sphere and paraboloid.

2. Relevant equations
Equation for sphere x2+y2+z2=2a2
Equation for paraboloid az = x2+y2 (a>0)

3. The attempt at a solution
Trying to find limits of integration:
For integration of dz, rearranging the both equation in terms of z, the limits are from
z= 1/a (x2+y2) to
z= SQRT (2a2 - x2 - y2)

Next i suppose i should find the equations in xy plane by solving the given equations simultaneously to determine where the sphere and paraboloid intersect. When i equate both equation, i got this expression
2a4= (x2+y2)2+a2(x2+y2). I got stuck here as I do not know how to find the limits for dx and dy. Do i need to use polar coordinates or sphere coordinates? Can anyone explain these to me? Thanks