Diagonal of a Polygon

Pronunciation: /daɪˈæ gə nl/ ?

Examples and non-examples of diagonals.
Figure 1: Examples of diagonals

A diagonal of a polygon or a polyhedron is a line between any two vertices of a polygon or polyhedron that are not adjacent.[1]

For the diagonal of a matrix, see Matrix.


  1. diagonal. merriam-webster.com. Encyclopedia Britannica. (Accessed: 2009-03-12). http://www.merriam-webster.com/dictionary/diagonal.
  2. Hilbert, David. The Foundations of Geometry, pg 28. Townsend, E. J., Ph. D.. The Open Court Publishing Company, 1950. (Accessed: 2009-12-21). http://www.gutenberg.org/files/17384/17384-pdf.pdf.
  3. Beman, Wooster Woodruff; and Smith, David Eugene. New Plane and Solid Geometry, pg 22. Ginn & Company, 1899. (Accessed: 2010-01-23). http://www.archive.org/stream/newplaneandsoli02smitgoog#page/n37/mode/1up/search/diagonal.

Printed Resources

Cite this article as:

Diagonal of a Polygon. 2010-01-23. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/d/diagonal.html.


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Revision History

2010-01-23: Added "References" (McAdams, David.)
2009-01-28: Added reference to diagonal to a matrix (McAdams, David.)
2008-06-07: Corrected spelling (McAdams, David.)
2008-05-01: Initial version (McAdams, David.)

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