http://www.onlinemathlearning.com/quadrilateral-properties.html

*More about diagonals:*

A

(source: http://en.wikipedia.org/wiki/Diagonal)

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**diagonal**is a line joining two nonconsecutive vertices of a polygon or polyhedron.(source: http://en.wikipedia.org/wiki/Diagonal)

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*diagonals*at the source.
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