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• Quadrilateral - Wikipedia, the free encyclopedia

  In geometry, a quadrilateral is a polygon with four sides or edges and four vertices or corners. Sometimes, the term quadrangle is used, for etymological symmetry with triangle ...

• Manio Quadrilateral

  The Manio Quadrilateral (Manio 3) Rectangular stone setting Carnac, Morbihan. Walk on past the riding school and there is a sign pointing up a path on the right.

• Quadrilateral -- from Wolfram MathWorld

  A quadrilateral, sometimes also known as a tetragon or quadrangle (Johnson 1929, p. 61) is a four-sided polygon. If not explicitly stated, all four polygon vertices are generally ...