Convert the Rectangular Equation to Polar Form $x ^ { 2 } + y ^ { 2 } = 49$

Multiple Choice

Convert the rectangular equation to polar form.Assume r > 1. $x ^ { 2 } + y ^ { 2 } = 49$

A) $r = 7$
B) $r = - 7$
C) $r = \frac { 1 } { 7 }$
D) $r = 49$
E) $r = - \frac { 1 } { 7 }$