All Triangles are Equilateral - Numberphile

https://www.youtube.com/watch?v=Yajonhixy4g

Publisher, Numberphile, Video, YouTube

A proof that all triangles are equilateral - can you see a problem with it?

 

From the Reddit discussion, here is a demonstration of the problem in GeoGebra.

9 November 2014 Edit: 9 November 2014


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