Question

how do you find the limits of integration when you are finding the area of the polar coordinates?
is it ALWAYS r=0, solve for theta?

Answer 1

you usually start at r=0, but not always. Say you had a disk where the inner edge was at r=3 and the outer at r=5. Then you'd pick the limits to integrate r from 3 to 5

Answer 2

Typically r is a function of theta and theta will run from 0 to 2Pi, but it varies