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Euclid's Proposition 1

Author:
Erik Tou
Euclid shows how to construct an equilateral triangle on any given line segment.
Note that I am using Euclid's original labeling scheme, as presented in David Joyce's web site on Euclid's Elements (http://aleph0.clarku.edu/~djoyce/java/elements/bookI/propI1.html).

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