With its bright colors, easy-to-learn rules and familiar music, the video game Tetris has endured as a pop culture icon over the past 40 years. Many people, like me, have been playing the game for ...

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.

Description: Incidence geometry in planes and space, separation in planes and space, angular measure, neutral geometry, history of the parallel postulate, Euclidean geometry of the plane and space, ...