Hello! A bit confused on Part C, but understand everything else. Thanks!

Given for part C:
[tex]\begin{gathered} r_1=3+3sin(\theta) \\ r_2=8+3cos(\theta) \end{gathered}[/tex]We will graph the two curves to find the difference between r1 and r2
The graph will be as follows:
As shown r2 represents the equation of a circle.