# Integrating a norm

1. Nov 15, 2009

### Matthollyw00d

$$\int$$|x|2 with respect to the vector x in the unit ball in Rn-2

I'm dealing with volumes of unit balls in Rn and after applying a change of variable to the last 2 components and Fubini's Theorem, I get that integral and can't find a way to integrate it. Any help on this?

2. Nov 15, 2009

### rochfor1

Generalized spherical coordinates.

3. Nov 15, 2009

### Matthollyw00d

Would that just make |x|2=r2? I've never worked with generalized spherical coordinates before, so could you elaborate a bit?

4. Nov 16, 2009

### Matthollyw00d

Nevermind, I found an alternate way.