Difference between revisions of "Quadrilateral"

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(Classification of Quadrilaterals)
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* A [[rhombus]] has four equal sides
 
* A [[rhombus]] has four equal sides
 
* A [[kite]] has two pairs of adjacent equal sides
 
* A [[kite]] has two pairs of adjacent equal sides
* A [[re-entrant quadrilateral]] has one internal angle greater than 180<sup>0</sup>
+
* A [[re-entrant quadrilateral]] has one internal angle greater than 180<sup>0</sup>; this may be contrasted with a [[convex quadrilateral]] in which all internal angles are less than 180<sup>0</sup>
 
* An [[arrowhead]] is a re-entrant [[kite]]
 
* An [[arrowhead]] is a re-entrant [[kite]]
 
* A [[square]] is both a [[rectangle]] and a [[rhombus]]
 
* A [[square]] is both a [[rectangle]] and a [[rhombus]]

Revision as of 06:31, 14 May 2007

A quadrilateral is a polygon with four sides.

As a consequence of the definition, the sum of the angles in a quadrilateral equals 360o, and all quadrilaterals are capable of tessellating an infinite plane.

Classification of Quadrilaterals

The classification of quadrilaterals is complex, as there are several intersecting sub-categories: