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Euclid's Elements

euclidBook 1: The 48 Propositions
1 On any given finite straight line to construct an equilateral triangle.
Related constructions
Proclus' scalene triangle.
AC is a radius of one of the two circles and D is a point on AC lying in that portion of the circle with centre A which is outside the circle with centre B. Then, joining BD we have a triangle, ABD, which is obviously scalene.
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