"There is no one way"

Wednesday, October 30, 2013

Unexpected ratio

Triangle ABC is equilateral.
MA/ME is the golden ratio!

(George Hart showed me this result some time ago.)

Vynce Montgomery pointed out that therefore, this could be a way to construct a pentagram. To respond to this challenge, I hid everything but MA and ME, and proceeded from there:


PS: thinking about this a few days later, it occurs to me that if you don't feel like doing the algebra, the second figure is pretty good confirmation of George's claim.

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