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Enneagon
From Wikipedia, the free encyclopedia
In geometry, an enneagon or nonagon is a nine-sided polygon. The name enneagon comes from Greek enneagonon, (εννεα, nine + γωνον, corner), while nonagon comes from Latin (nonus, "ninth" + gonon). Enneagon is usage consistent with, for example, hexagon; in practice nonagon is often used.
A regular enneagon has internal angles of 140°. The area of a regular enneagon of side length a is given by
Although a regular enneagon is not constructible with compass and straightedge there are methods of constructing that are very close approximations.
- Properties of a Nonagon With interactive animation
| Polygons |
|---|
| Triangle • Quadrilateral • Pentagon •Hexagon • Heptagon • Octagon • Enneagon (Nonagon) • Decagon • Hendecagon • Dodecagon • Triskaidecagon • Pentadecagon • Hexadecagon • Heptadecagon • Enneadecagon • Icosagon • Chiliagon • Myriagon |