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A plane figure consisting of four points, each of which is joined to two other points by a Line Segment (where the line segments may intersect). A quadrangle may therefore be Concave or Convex; if it is Convex, it is called a Quadrilateral.

See also Complete Quadrangle, Cyclic Quadrangle, Quadrilateral

© 1996-9 Eric W. Weisstein