Do Triangles Have Four Sides? #shorts

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I've been working on a new Vsauce1 video for the last few months -- I always seem to pick topics that take A LOT of research ... and I love it :) It'd be rad if I made quicker videos, but then the stories and topics I wanted to tell wouldn't get told :( Luckily, shorts let me share some delicious little nugs in the meantime ;)

In this short, we say hello to the "Sherman line" -- a feature of all triangles that made B.F. Sherman say, "what else was there to call [it] but the fourth side of the triangle?”

Sherman's original paper:
https://www.jstor.org/stable/2690519