Find the surface area of the circular paraboloidz = x^2+ y^2" alt="z = x^2+ y^2" />between
the xy-plane and the plane z = 4.
The limits have suddeny become for double integration
and 3 and 0
r = (x^2 + y^2)^0.5
x = r cos theta
y = r sin theta
and theta = inverse tan (x/y)
How do i get these limits? Thanks.