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

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

See also

geometry

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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See also: Enneadecagon, Chiliagon, Decagon, Dodecagon, Enneagon, Geometry, Hectagon, Hendecagon