Parallel geometry tasks with four levels of complexity involve students in writing and understanding proof.
Bobson Wong and Larisa Bukalov
Christine K. Pritchard and John H. Lamb
Teaching a visual subject to a visually challenged student inspires strategies that benefit all students in a class.
Tongta Somchaipeng, Tussatrin Kruatong, and Bhinyo Panijpan
Students use balls and disks to prove the general formulas for sums of squares and cubes.