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Van Aubel's Theorem (GEOM-10)

Author:
Loizos Loizou
The Futility Closet reminded me today of one of the greatest 'how is that possible' theorems in plane geometry: Van Aubel's Theorem. http://www.futilitycloset.com/2015/08/07/van-aubels-theorem/ What is going on here? Why is it true?
More GeoGebra at bit.ly/mh-ggb

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