Drjimo

Author's details

Date registered: March 1, 2015

Latest posts

  1. Forging Connections and Web Sketchpad — May 11, 2020
  2. Minimizing Polyhedra — July 11, 2017
  3. KaleidoTile — June 7, 2017
  4. Ball of Whacks — October 30, 2016
  5. Prince Rupert’s cube — October 25, 2016

Author's posts listings

May 11

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. https://geometricfunctions.org/fc/ is the main website. Workshop agenda and links are here: https://geometricfunctions.org/fc/present/online-workshop-05-11-2020/ For Web Sketchpad (this is a free, web, version of Geometer’s Sketchpad, see the graphic for a good place to …

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Jul 11

Minimizing Polyhedra

article on minimizing polyhedra https://imaginary.org/hands-on/minimizing-polyhedra

Jun 07

KaleidoTile

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. http://geometrygames.org/KaleidoTile/index.html

Oct 30

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 …

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Oct 25

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. https://en.m.wikipedia.org/wiki/Prince_Rupert%27s_cube 

Jun 20

Article: 5 Reasons Why Origami Improves Students’ Skills

5 Reasons Why Origami Improves Students’ Skills http://www.edutopia.org/blog/why-origami-improves-students-skills-ainissa-ramirez

Jun 08

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 …

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