info prev up next book cdrom email home


A tool with two arms joined at their ends which can be used to draw Circles. In Geometric Constructions, the classical Greek rules stipulate that the compass cannot be used to mark off distances, so it must ``collapse'' whenever one of its arms is removed from the page. This results in significant complication in the complexity of Geometric Constructions.

See also Constructible Polygon, Geometric Construction, Geometrography, Mascheroni Construction, Plane Geometry, Polygon, Poncelet-Steiner Theorem, Ruler, Simplicity, Steiner Construction, Straightedge


Dixon, R. ``Compass Drawings.'' Ch. 1 in Mathographics. New York: Dover, pp. 1-78, 1991.

© 1996-9 Eric W. Weisstein