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# What is a nine-sided polygon called?

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A nine-sided polygon is called a nonagon. The prefix "non" is derived from the Latin "nonus," which means "ninth" to allude to the nine sides and angles of the polygon.

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Another less common name for the nonagon is "enneagon." The name is derived from the Greek word "enneagonon," where "ennea" means "nine," and "gonon" means "corner." Thus, "enneagonon" means "nine corners," which is an accurate description of this polygon. Nonagons can be divided into regular and irregular nonagons. A regular nonagon has nine equal sides and nine equal internal angles of 140 degrees. An irregular nonagon has at least one side either longer or shorter than the rest.

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## Related Questions

• A:

A nonagon is a closed shape that has nine sides. If it is a regular nonagon, all nine sides are the same length, and all the angles are equal.

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A two-dimensional shape with nine straight sides is called a nonagon. This nine-sided polygon, which also has nine edges or vertices, is also called an enneagon. The term enneagon is preferable, but less popular than the name nonagon because the latter is simpler to spell and pronounce.

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A 100-sided polygon is called a hectogon, centagon or 100-gon. In general, any n-sided polygon with over 12 sides is called an n-gon. While there are other conventions for naming polygons with any number of sides, it is most common to use the n-gon form.