## anonymous 5 years ago does anyone understand double integrals in polar??

1. anonymous

yes

2. anonymous

I can think of several people who do actually.

3. anonymous

okay can you help with the following problem? use polar coordinates to find the volume of the given solid: above the disk ${x ^{2}+y ^{2} \le4}$ and under the cone z=$\sqrt{x ^{2}+y ^{2}}$

4. anonymous

Yes. Just replace $$x^2 + y^2$$ with $$r^2$$ and integrate from $$0 \le r \le 2$$

5. anonymous

why 0 to 2 and not -2 to 2. if you look at the disk isn't a circle with center (0,0) and radius 2?