# Thread: Area of a torus

1. ## Area of a torus

Any help you could give would be wonderful! Thanks!

The circle is revolved about the line thus generating a torus (doughnut). Find its surface area.

2. We are in the same class.

2∏a (2∏b-0)= 4∏^2ab

3. How did you get the answer? Can you give me specifics? Thanks!

4. The formula for the surface area of a torus is A=4π^2ab, where b is the radius of the tube and a is the distance from the center of the tube to the center of the torus.