Question

The point Y with coordinates (-9,5) is rotated counterclockwise about the

origin to Y'(9,-5). How many degrees was the point rotated? *

Answer 1

180°

Explanation:

The reflection of a point (x,y) by 180° yields a point (-x,-y). That is, the coordinates are multiplied by -1. So, The point Y with coordinates (-9,5) rotated counterclockwise about the origin to Y'(9,-5) is rotated by 180° since, the coordinates are multiplied by -1.