# Double Integral Surface Area of Spherical Ball

1. Nov 13, 2013

### Philosophaie

1. The problem statement, all variables and given/known data

Double Integral Surface Area of Spherical Ball radius

2. Relevant equations

$\int_S d\vec{S} = 4*\pi*a^2$

3. The attempt at a solution

$\int\int_0^a f(r,?) dr d? = 4*\pi*a^2$

Last edited: Nov 13, 2013
2. Nov 13, 2013

### LCKurtz

What is the dS element in spherical coordinates?

3. Nov 13, 2013

### Philosophaie

$dS = r^2*sin\phi*d\theta*d\phi$

I can take it from here!

4. Nov 13, 2013

### LCKurtz

Good. Remember the only two variables are $\theta$ and $\phi$. The radius is constant.