# Math Help - Surface Area of Annulus

1. ## Surface Area of Annulus

What is it?

2. I belive you mean a torous?

3. There is an easy way to find the area of a torus.

Remember, it can be isometrically transformed into a parallelogram; So the respective areas will be the same.

(Try two cuts; one vertical, and after this, one across the lower end circle).