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The Kid Should See This

How Round Is Your Circle? Physical models of abstract math

A series of visual examples from the book How Round Is Your Circle: “John Bryant and Chris Sangwin illustrate how physical models are created from abstract mathematical ones.”

We liked watching all of these, but Dudeney’s Dissection — cutting an equilateral triangle into pieces which can be rearranged into a square via well-placed hinges — is definitely the kid’s and my favorite. 

Math FTW!

Update: Get your own Solids of constant width from the team at Maths Gear.

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