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clean up & uniformity
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]]
As a result of this definition:
* Each pair of opposite sides is of equal length.
* Opposite sides are parallel
* Diagonals are equal
* Adjacent sides are perpendicular
* Area = product of any two adjacent sides
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]].
==Notes==
<references/>
[[Category:Plane Geometry]]