Find a Polar Equation for the Circle $$( x + 9 ) ^ { 2 } + y ^ { 2 } = 81$$

Multiple Choice

Find a polar equation for the circle.
- $$( x + 9 ) ^ { 2 } + y ^ { 2 } = 81$$

A) $r \cos \theta = - 18$
B) $r = - 18 \sin \theta$
C) $\mathrm { r } = 18 \cos \theta$
D) $r = - 18 \cos \theta$