Using polar coordinates, evaluate the integral which gives the area which lies in the first quadrant between the circles and
i tried setting it up like this but could get the right answers
r^2 = 400
r = 20
r^2 = 20rcosΘr = 20cosΘ
i dont know how to use math tags
but my integral for dΘ would be from 0 to 2pi
and my integral for dr would be from 20cosΘ to 20i integrated the f(x,y) = 1, because that is volume, right?