The Letters X and Y Represent Rectangular Coordinates $$x ^ { 2 } + y ^ { 2 } - 4 x = 0$$

Multiple Choice

The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, θ) .
- $$x ^ { 2 } + y ^ { 2 } - 4 x = 0$$

A) $r = 4 \cos \theta$
B) $r \cos ^ { 2 } \theta = 4 \sin \theta$
C) $r \sin ^ { 2 } \theta = 4 \cos \theta$
D) $r = 4 \sin \theta$