Find an Equation in Cylindrical Coordinates for the Equation Given $$9 x ^ { 2 } + 9 y ^ { 2 } = 8 x$$

Multiple Choice

Find an equation in cylindrical coordinates for the equation given in rectangular coordinates. $$9 x ^ { 2 } + 9 y ^ { 2 } = 8 x$$

A) $r ^ { 2 } = \frac { 8 } { 9 } \sin \theta$
B) $r = \frac { 8 } { 9 } \sin \theta$
C) $r = \frac { 8 } { 9 } \cos ^ { - 1 } \theta$
D) $r = \frac { 8 } { 9 } \cos \theta$
E) $r = \frac { 9 } { 8 } \cos \theta$