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Construct an equilateral triangle of given side length with compass and straightedge
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1. Construct an equilateral triangle whose side is equal in length (congruent to) the segment AB.
2. Construct an equilateral triangle whose sides are congruent to the segment AB.
One side of the triangle should be the a part of the given ray.
One vertex of the triangle should be the endpoint of the ray, like the figure on the right: