Patty Paper® Geometry was designed as a resource to supplement high school geometry courses or as a text in pre-geometry, pre-algebra, and middle grades mathematics programs. An investigation set may take two to three days, and the exercise sets may take an additional two to three days. Duration will vary depending on age, abilities, and how well students work cooperatively. This 274 page black-line master book contains both guided and open investigations. The guided investigations provide step