Editing Rectangle (section)

===Rectangle-rhombus duality===
The [[dual polygon]] of a rectangle is a [[rhombus]], as shown in the table below.<ref>de Villiers, Michael, "Generalizing Van Aubel Using Duality", ''Mathematics Magazine'' 73 (4), Oct. 2000, pp. 303–307.</ref>

{|class="wikitable" style="text-align:center"
|-
!Rectangle !! Rhombus
|-
|All ''angles'' are equal.
||All ''sides'' are equal.
|-
|Alternate ''sides'' are equal.
||Alternate ''angles'' are equal.
|-
|Its centre is equidistant from its ''[[Vertex (geometry)|vertices]]'', hence it has a ''[[circumcircle]]''.
||Its centre is equidistant from its ''sides'', hence it has an ''incircle''.
|-
|Two axes of symmetry bisect opposite ''sides''.
||Two axes of symmetry bisect opposite ''angles''.
|-
|Diagonals are equal in ''length''.
||Diagonals intersect at equal ''angles''.
|}
* The figure formed by joining, in order, the midpoints of the sides of a rectangle is a [[rhombus]] and vice versa.