# Problem on advanced plotting [closed]

How can I resolvve this:

Create a plot for the following problem. Find the area that is inside the circle r=2, but outside the cardioid 2+2cos(θ).

My code:

`var('a')`

`polar_plot([2,2+2*cos(a)],(a,0,2*pi))`

When I add the parameter fill=RealNumber, the area is filled, but I can't control what the area; what means this parameter?