It's been 2 years since I've looked at this stuff, and I'm trying to make sense of all of this. How would I evaluate:

$\displaystyle \iint_\sigma \bigg(x^2+y^2\bigg)z \,dS$

Where $\displaystyle \sigma$ is the portion of the cone $\displaystyle z=\sqrt{x^2+y^2}$ between the planes $\displaystyle z=1$ and $\displaystyle z=2$.

My biggest problem is setting it up properly.

Any help would be appreciated.

--Chris