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Construction from 'All Triangles are Equilateral'

Author:
teagonia
Topic:
Equilateral Triangles, Triangles
This is the construction used in the video: http://youtu.be/Yajonhixy4g by Numberphile. It shows how both C' and B' can never be inside the Triangle ABC at the same time, wich is said to be possible in the video.

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