Question

!00 points HELP!!!!! Missy’s rotation maps point K(17, –12) to K’(12, 17). Which describes the rotation?

270° counterclockwise rotation
90° counterclockwise rotation
90° clockwise rotation
180° rotation

Answer 1

90° counterclockwise rotation

Explanation:

A 90° counterclockwise rotation maps every point (x, y) to (-y, x).

K(17, -12) is mapped to K'(12, 17). The x- and y-coordinates are switched and the y-coordinate is negated (before being switched). This means

(x,y)→(-y,x).

This is a 90° counterclockwise rotation.

Answer 2

90° counterclockwise rotation

Plot the situation