Which set of polar coordinates describes the same location as the rectangular coordinates (0, -2)

Polar coordinates identifie the points of the plane by a distance from the reference point and an angle from a reference direction.

In this case the distance of (0,-2) from the origin is 2 and the anglefrom the x-axis is 180°. So the polar coordinates are (2, 180°)

 

Then why is the question on here if you know the answer