Euclid's Muse

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Search Results for “protractor”

By Andrew Zhao
Euclids Elements – Book 4 – Proposition 11
Can you create a regular pentagon without a protractor? Because it’s pretty impressive how Euclid did it with only a compass and a ruler. Note that the yellow triangle is similar to the one inside the pentagon.

Tags: Euclid, Elements, Geometry, Pentagon, Triangle


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