Hello, chaddy!

What is the volume of the solid generated by revolving the region

enclosed by about the y-axis?

Make a sketch. We have a circle with center (2,0) and radius 1

. . revolved about the y-axis.

This results in atorus(donut).

I recommend using Shells: .

The radius is:

The height is: .

We must evaluate: .

Good luck!