Given a point (x,y) on a geometric figure, what is the new point when the figure is rotated counterclockwise about the origin 180°?
When a point (x,y) is rotated counterclockwise about the origin 180°, the new point (x',y') is obtained by negating both the x and y coordinates of the original point.
Therefore, the new point (x',y') is (-x, -y).