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A '''rectangle''' is a [[polygon]] of four sideswhere every angle is a right angle (90°). Each pair <ref>There are many definitions of opposite sides is of equal length. However''rectangle'', the adjacent sides do not need but it seems sensible to be of equal length. The adjacent sides also are perpendicular. A specific case use one which is the based on [[squareangle]]properties rather than length or parallelism properties. Definition adapted from http://www.mathsisfun.com/definitions/rectangle.html</ref>

  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/> [[categoryCategory:geometryPlane Geometry]]