Ricordi Dimenticati

thekidshouldseethis:

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 co-curator’s and my favorite. 

Math FTW!