Question

Triangle XYZ is rotated 90° counterclockwise about the origin.The result is Triangle X'Y'Z', as shown below.

Answer 1

A shortcut for a 90° counterclockwise rotation:

• If the point (h, k) is rotated 90° counterclockwise rotation, then the final point will be (-k, h).

Answer:

Therefore the coordinates would be:

• X,(-5, 3) → ,X',(-3, -5)

,

• Y,(-1, 1) → ,Y',(-1, -1)

,

• Z,(-8, -4) → ,Z',(4, -8)

Then, the rule is (x, y) → (-y, x).