Simple yet 5000 years missed ?

Good news! You really can still discover new beautiful maths without being a PhD mathematician. Stumbled across this one while working on the magic squares video. Another curious discovery by recreational mathematician Lee Sallows. A simple and beautiful and curious fact about triangles that, it appears, was first discovered only 10 years ago. Really quite amazing that this one got overlooked, considering the millennia old history of triangles. Wiki page dedicated to Lee Sallows https://en.wikipedia.org/wiki/Lee_Sallows His personal homepage https://www.leesallows.com The relevant subpage http://tinyurl.com/y6tzsbjt t-shirt: https://www.teepublic.com/t-shirt/300445-the-impossible-board-game music: Campagna - Adventure of a Lifetime Enjoy! Burkard