Volumes of Revolution - Hyperbola

Hi,

I'm hoping someone can help me with a question about volumes of revolution of hyperbolas.

I have a question asking for the volume of a hyperbola shape (see attached ppt).

I understand that I need to re-aarrange in terms of (x^2) and intergrate etc.

But I want to know what limits i apply to find the definite integral and what i use the dimensions for.

Thanks in advance