For the Given Rectangular Equation, Give Its Equivalent Polar Equation $$x ^ { 2 } + y ^ { 2 } = 36$$

Multiple Choice

For the given rectangular equation, give its equivalent polar equation.
- $$x ^ { 2 } + y ^ { 2 } = 36$$

A) $r = 6 \sin \theta$
B) $r = 36$
C) $r = 6 \cos \theta$
D) $r = 6$