# Rectangle

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A polygon of four sides where every angle is a right angle (90°)^{[1]}.

As a result of this definition:

- Each pair of opposite sides is of equal length.
- Opposite sides are parallel
- Diagonal are equal
- Adjacent sides are perpendicular

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.

### Notes

- ↑ 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