Question

Identify the surface

I have got the correct answer but my approach is always different and I'd like to find a more fundamental approach that would work for all surfaces.

1) rho^2[sin^2(rho)sin^2(theta)+cos^2(rho)]=36
This is a cylinder with a radius of 6
My approach noticed this also take the form of
rho^2(x^2+z^2)=6^2

2)
Sin(theta)Sin(rho) = rho

Please help and explain how you came to your conclusion.