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On a given finite straight line to construct an equilateral triangle.
• Start with the line segment AB.
• Create a circle around point A with a radius of AB.
• Construct another circle around point B with a radius of BA.
• Create a third point, C, where the two circles intersect.
• Join point C to points A and B.
The equilateral triangle ABC has now been constructed on the given line AB.

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