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Q:

# What is the name of a nine-sided shape?

A:

A nine-sided shape is called a nonagon or enneagon. A nonagon is a type of polygon. Polygons are closed-plane figures that are made of line segments.

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The name "nonagon" is derived from the combination of the Latin word "nonus," which means "ninth," and the Greek word "gonu," or "knee." The name "enneagon," derived wholly from Greek, is less common. The literal translation is "nine corners." The nonagon is an equilateral polygon. All of the lines are the same length, and the shape is convex. A straight line can be drawn through the shape, and it crosses two sides. Every interior angle is less than 180 degrees.

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## Related Questions

• A:

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 shape with 24 sides is called an icosikaitetragon. Greek prefixes are used for naming shapes by the number of sides. Numbers above 20 have additional special rules that must be followed to construct their names.

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The polygon with 1,000 sides, 1,000 vertices and 1,000 angles is called a chiliagon or a 1,000-gon. The term "chiliagon," with a Greek-derived prefix meaning “thousand,” is a proposed name for the 1,000-sided, two-dimensional shape, but it is seldom used.