Changes

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 ais based on [[angle]] properites reather than length or papallesim properties. Definition adapted from http://www.mathsisfun.com/definitions/rectangle.html </ref>.

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]]

[[Image:Rectangle.gif]]

* Each pair of opposite sides is of equal length.

* Each pair of opposite sides is of equal length.

* Opposite sides are parallel

* Opposite sides are parallel

* Diagonal are equal

* Diagonals are equal

* Adjacent sides are perpendicular

* Adjacent sides are perpendicular

However, the adjacent sides do not need to be of equal length.

However, the adjacent sides do not need to be of equal length.

A special case of a rectangle is is the [[square]], which is also a [[rhombus]].

A special case of a rectangle is the [[square]], which is also a [[rhombus]].