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[[Image:Rhombus.svg|300px|thumb|A rhombus.]]

[[Image:Rhombus.svg|300px|thumb|A rhombus.]]

A '''rhombus''' is a [[parallelogram]] (four-sided [[polygon]] where opposite sides are [[parallel (geometry)|parallel]]) with all sides equal in length. A rhombus with all angles equal is called a [[square (geometry)|square]]. A rhombus is usually tilted on its side. It comes from the [[Greek language|Greek]] word ''rhombos'', meaning "spinning top".<ref>{{Cite web

A '''rhombus''' is a [[parallelogram]] with all sides equal in length. A rhombus with all angles equal is called a [[square (geometry)|square]]. The word ''rhombus'' comes from the [[Greek language|Greek]] word ''rhombos'', meaning "spinning top".<ref>{{Cite web

  |url= http://www.etymonline.com/index.php?search=rhombus&searchmode=none

  |url= http://www.etymonline.com/index.php?search=rhombus&searchmode=none

  |title=Online Etymology Dictionary

  |title=Online Etymology Dictionary

  |work=etymonline.com

  |work=etymonline.com

  |accessdate=10 January 2011

  |accessdate=10 January 2011

}}</ref> a rhombus is also know as diamond

}}</ref> A  rhombus is sometimes called a diamond, but not all rhombi are diamond shaped.

To find the perimeter of a rhombus, just add up all the sides. Also opposite sides are parallel and opposite angles are equal. Another interesting thing is that the diagonals (dashed lines in second figure) meet in the middle at a right angle.

== References ==

== References ==

{{Math-stub}}

{{Math-stub}}

[[Category:Polygons]]

[[Category:Polygons]]