The document discusses rotations in geometry. It defines a rotation as turning a figure about a fixed center point called the center of rotation. The angle of rotation is measured from the center of rotation to a point and its image after rotating. Rules for rotating figures about the origin by 90, 180, and 270 degrees are given. Rotation matrices for rotating by 90, 180, 270, and 360 degrees are presented. The document states that a rotation is an isometry according to the Rotation Theorem. Homework problems from page 602 numbers 4 through 20 are assigned with the even problems selected.