spacing
Despite this post’s rather gory sounding title, Dudeney’s dissection is pure geometry, where professor, nick-knack collector, and youtuber henders007 demonstrates with a beautifully made model how Henry Ernest Dudeney (1857-1930) discovered how to change a square into a triangle with only 4 moves, despite other mathematicians struggles to get beyond 5. It is pure genius, and even after watching the video over and over again, I am still amazed.
spacing
(via Youtube)
brillant…
I shall do this.