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An idealized mathematical object having a rigorously straight edge which can be used to draw a Line Segment. Although Geometric Constructions are sometimes said to be performed with a Ruler and Compass, the term straightedge is preferable to Ruler since markings on the straightedge (usually assumed to be present on a Ruler) are not allowed by the classical Greek rules.
See also Compass, Geometric Construction, Geometrography, Mascheroni Constant, Polygon, Poncelet-Steiner Theorem, Ruler, Simplicity, Steiner Construction