A torus (a doughnut-shaped object) is formed by revolving the circle $$x^2 + y^2 = a^2$$ about the vertical line $x = b$, where $0 < a < b$. Find its volume.
I have tried to create an integral that makes sense but I keep getting it wrong. We are learning shell method and disk method if that helps. I'm just stuck at where I should even start with this problem. Any help would be appreciated!