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Enneadecagon

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An enneadecagon.
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An enneadecagon.

An enneadecagon is a polygon with 19 sides and angles. It is also known as an enneakaidecagon. The internal angles of a regular enneadecagon each measure approximately 161.052 degrees, and the area with side length of a is given by

A = \frac{19}{4}a^2 \cot \frac{\pi}{19} \simeq 28.4652 a^2.
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See also


Polygons
Triangle | Quadrilateral | Pentagon | Hexagon | Heptagon (Septagon) | Octagon | Enneagon | Decagon | Hendecagon | Dodecagon | Triskaidecagon | heptadecagon | enneadecagon | icosagon | 30-gon | 50-gon | hectagon | chiliagon | myriagon
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