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>.
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[[Image:Rectangle.gif]]
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As a result of this definition:
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* Each pair of opposite sides is of equal length.
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* Opposite sides are parallel
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* Diagonals are equal
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* Adjacent sides are perpendicular
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* Area = product of any two adjacent sides
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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]].