The Polar Equation of a Circle Is Given $r = - 4 \cos \theta$

Multiple Choice

The polar equation of a circle is given. Give polar coordinates for the center of the circle and identify its radius.
- $r = - 4 \cos \theta$

A) $\mathrm { C } ( - 2,0 )$ , radius $= 2$
B) $\mathrm { C } ( - 4,0 )$ , radius $= 4$
C) $\left( 2 , \frac { \pi } { 2 } \right)$ , radius $= 2$
D) $\left( 4 , \frac { \pi } { 2 } \right)$ , radius $= 4$