1.Place your trapezoid somewhere in the middle of Quadrant I. Label it A. Line your trapezoid up with the squares on the grid please, and make sure ONE vertex is on the ORIGIN. 2.Put your pencil on the origin and rotate the trapezoid 90º counter-clockwise. Label it A’. Q I Q II Q III Q IV Do this On the Document Camera. Or not. Q III A A’

1.Do another 90º rotation counter-clockwise. You should end up in Quadrant III. Label it A’’. Q I Q II Q III Q IV pre-image More rotations about from a vertex... Do this On the Document Camera. Or not. Q III A” A’ A

1.Pick any 2 CORRESPONDING points. 2.Label the coordinate points and take a close look at them. 3.Look only at the numbers. Ignore everything else. 4.How do the numbers change? 5.Predict what the coordinates would be if you do another 90º rotation. A” A’ A (4,6) (-6,4) 90º (?,?) (-4,-6)