Self-Checked Activities Read the instructions for the following activities and type in your responses. At the end of the lesson, click the link to open the Student Answer Sheet. Use the answers or sample responses to evaluate your own work. 1. Rotations A rotation is a transformation that can map a figure back onto itself. Use the GeoGebra geometry tool to explore this property of rotations and complete each step below. If you need help, follow these instructions for using GeoGebra. a. Use the slider to rotate pentagon ABCDE about the center of rotation, R. The angle through which the pentagon is rotated is _ CRC', represented by the variable a, where 0' s a