Modern Geometry of the Triangle: https://t.co/asTXe1va9T
A Tour of Triangle Geometry: https://t.co/UBTM1Mztu6
Coxeter's Kaleidoscopes: https://t.co/cwRzd6ZRjy
The Complete Quadrilateral: https://t.co/9Rcu1gSbYm

— Steve Phelps (@MathTechCoach) June 6, 2019

Pythagoras proof by Perigal's dissection using #GeoGebra pic.twitter.com/MitNTW9Uad

— Vincent Pantal🍩ni (@panlepan) November 14, 2016

Enjoy this Pythagorean Theorem "Proof Without Words" dissection puzzle in @geogebra.
The sum of the areas of regular hexagons built on the legs is equal to the area of the hexagon built on the hypotenuse. https://t.co/J15iSCNxXy#mtbos #iteachmath #pythagoreantheorem pic.twitter.com/tKmxMp5bo5

— Steve Phelps (@MathTechCoach) May 31, 2019