	The Language of Mathematics - Dictionary and Research Guide		Provided by

quadrilateral

In geometry, a quadrilateral is a polygon with four sides and four vertices. Sometimes, the term quadrangle is used, for etymological symmetry with triangle, and sometimes tetragon for consistence with pentagon.

Wikipedia and Wikis

Quadrilateral - Wikipedia
http://en.wikipedia.org/wiki/Quadrilateral

Other

Compendium Geometry
http://www.vias.org/comp_geometry/geom_quad_genera ...
Quadrilaterals Formed by Perpendicular Bisectors
http://www.cut-the-knot.org/Curriculum/Geometry/Pe ...
Varignon and Wittenbauer Parallelograms
http://agutie.homestead.com/files/VarigWitten.htm
Projective Collinearity in a Quadrilateral
http://www.cut-the-knot.org/Curriculum/Geometry/Pr ...
Van Aubel's theorem
http://agutie.homestead.com/files/vanaubel.html

Keywords and Synonyms

quadrilateral, Trapezium, Tetragon, Quadrilaterals, Quadrialateral

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