Convert an Equation from Rectangular to Polar Coordinates
- $$x ^ { 2 } + y ^ { 2 } = 4$$

Multiple Choice

Convert an Equation from Rectangular to Polar Coordinates
- $$x ^ { 2 } + y ^ { 2 } = 4$$

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