# Math Help - Surface area of ball

1. ## Surface area of ball

Find the surface area of the unit ball.

2. Originally Posted by learn18
Find the surface area of the unit ball.
Using the formula or calculus?

The Surface Area of a sphere is:

A = 4pi*r^2

3. Calculus, this was a review problem that I cannot do for my calculus final.

4. Originally Posted by slowcurv99
Calculus, this was a review problem that I cannot do for my calculus final.
Do you want me to do this by rotating a circle? If not, what method are you guys using right now?

5. Well I dont know about him, But I have a review problem for my final in calculus 4 that asks that question and states nothing else...So I am assuming you can do it whichever way? But I have no clue how to do it.

6. Solution using calculus.(see attach)
Using geometry is easy.
Surface area is 4 pi radius^2, since the radius is 1, the answer is 4 pi