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]]>https://imaginary.org/hands-on/minimizing-polyhedra

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

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]]>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 is the Golden Ratio.

Good stuff at https://en.wikipedia.org/wiki/Rhombic_triacontahedron

It is the dual of the Icosidodecahedron (which is Archimedean), which is the Hoberman Sphere.

I have a light in my office (which was a gift from my kids) which is the rhombic triacontahedron.

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

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]]>The post Article: 5 Reasons Why Origami Improves Students’ Skills appeared first on Beauty of Three Dimensions.

]]>http://www.edutopia.org/blog/why-origami-improves-students-skills-ainissa-ramirez

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]]>The post I’ll be doing a Beauty of Three Dimensional Polyhedra Workshop appeared first on Beauty of Three Dimensions.

]]>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 I’ve come across over the years for building polyhedra. For example, we’ll build with coffee stirrers (really cheap, less than 10 cents for the icosahedron), origami (about 25 cents for the Buckyball), and retail manipulatives (a few dollars for the truncated tetrahedron). We will also look at some online tools for exploring (and enjoying) the Platonic and Archimedean solids and their mathematical relationships and properties. These dynamic tools are useful is seeing how, for example, the snub icosidodecahedron is formed. (Attendees are encouraged to bring a laptop or device to the workshop.) Included will be how the icosahedron

(this is the MAA!) can be built using three golden rectangles.

**Organizer:** James R. Olsen, Western Illinois University

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