Constructing an angle’s trisectors

I really enjoyed this video about how to trisect angles. Trisection of arbitrary angles is impossible using only a straightedge and compass; however, it is possible by carefully folding a piece of paper.

For further reading:

http://mars.wne.edu/~thull/papers/amer.math.monthly.118.04.307-hull.pdf

https://en.wikipedia.org/wiki/Huzita%E2%80%93Hatori_axioms

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1 Comment

  1. I remember running across an angle trisection with compass, straightedge, and two marks in Courant and Robbins’s What Is Mathematics and feeling like I’d been let in on a deep secret of the universe.

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