Author's posts

Forging Connections and Web Sketchpad

I attended (5/11/2020) a 2 hour webinar that was very good. It was very good. They have good goals and good guiding principles. is the main website. Workshop agenda and links are here: For Web Sketchpad (this is a free, web, version of Geometer’s Sketchpad, see the graphic for a good place to …

Continue reading

Minimizing Polyhedra

article on minimizing polyhedra


KaleidoTile is a colorful program for investigating Tilings, Symmetry, and Polyhedra.  I remember seeing it many years ago. I’m glad to see that Jeff Weeks is continuing to update it.  FREE download.

Ball of Whacks

Update: I turned this into a full page:  Top 8 Interesting Things to Know about the Rhombic Triacontahedron Ball of Whacks is a geometry toy. (Available online and in toy stores that sell cool stuff.) It is a rhombic triacontahedron.  Each of the 30 rhombic faces are golden, in that the ratio of the diagonals …

Continue reading

Prince Rupert’s cube

Cut a hole in one cube so that a cube of the same size (actually one slightly bigger!) can pas through. 

Article: 5 Reasons Why Origami Improves Students’ Skills

5 Reasons Why Origami Improves Students’ Skills

I’ll be doing a Beauty of Three Dimensional Polyhedra Workshop

Beauty of Three Dimensional Polyhedra Workshop (in Celebration of the MAA’s Centennial) MathFest at Washington, DC. Friday, August 7, 2015, 1:00-2:20 p.m., Maryland C Description: I have long been fascinated by the Platonic and Archimedean solids and their mathematical beauty. In this workshop I will demonstrate, and we will work with, a variety of materials …

Continue reading