Tony Foster's Proof of Viviani's Theorem
What Might This Be About?
23 February, 2017, Created with GeoGebra
The sum of distances of a point inside an equilateral triangle or on one of its sides equals the length of its altitude.
The theorem is named after Vincenzo Viviani (1622-1703).
The above is a slight modification of Tony Foster's proof of Viviani's theorem.