Using cylindrical coordinates, evaluate (OVER R) $\displaystyle \int \int \int \sqrt{x^2+y^2} dV$ , where the solid R is bounded by the surfaces $\displaystyle z=\sqrt{x^2+y^2}$ and z=5.

OK, I know how to graph these two surfaces, But how in the earth can I find the limits of the integration?

the "$\displaystyle dz$" limits: $\displaystyle 5 \rightarrow r$

but what about "$\displaystyle d\theta$" and "$\displaystyle dr$" ??!