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A [[polygon]] of four sides. Each pair of opposite sides is of equal length. However, the adjacent sides do not need to be of equal length. The adjacent sides also are perpendicular.  A specific case is the [[square]].

A '''rectangle''' is a [[polygon]] of four sides where every angle is a right angle (90°).<ref>There are many definitions of ''rectangle'', but it seems sensible to use one which is based on [[angle]] properties rather than length or parallelism properties. Definition adapted from http://www.mathsisfun.com/definitions/rectangle.html</ref>

 

[[Image:Rectangle.gif]]

 

 

* Each pair of opposite sides is of equal length.

 

Please note that the adjacent sides may or may not be of equal length. The special case where all four sides of a rectangle are equal is called a [[square]], which is also a [[rhombus]] and a [[kite]].