Materials were written for an entire year's course in geometry in which transformations were used to develop the concepts of congruence, similarity, and symmetry, as well as being a vehicle for proof.

To learn the geometric concept of transformations this year, Crystal Watson’s eighth-graders drew up blueprints of apartments. As they worked, she asked them to imagine designing affordable housing ...

THIS most welcome treatise fills a serious gap in English mathematical literature. It provides for the first time a comprehensive account of the general transformation theory which steadily dominates ...