We talked about 90, 180, 270, and 360 degree rotations. I used a pencil and rotated it to give Sam a visual of the clockwise and counter-clockwise rotations. I taught her some rules - when you rotate a point 180 clockwise about the origin, the coordinates map from (x,y) to (-x, -y). When you rotate a figure 90 counterclockwise, the new coordinate mapping is (x,y) to (-y,x). Also, if an object is rotated 180 or 360 degrees about the origin, the slopes of the new image will be the same as the original. If a shape is rotated 90 or 270, the slopes are opposite reciprocals. Sam worked exercises 1 & 2 on p.348, and we will continue in the next session.