Hi - I'm stuck on a problem to find the volume of a Tori/Torus. I can find a 2 variable parameterization (which allows me to compute the surface area by double integral for the first part of the question) but cant find a way to set it in 3 (spherical coords) to compute the volume.

The equation of the shape is:

If anyone can help me out with the transformation to spherical and intervals I'd appreciate it...

Thanks, F