Icosagon

In geometry, an icosagon is a twenty-sided polygon.

The interior angle of a regular icosagon is 162°, and the area with a side length of a is given by

$A = 5a^2 \cot \frac{\pi}{20} \simeq 31.5688 a^2.$

Notable icosagons include the swastika.

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

Missing image
Geometry_stub_icon.png

This geometry-related article is a stub. You can help Wikipedia by expanding it.

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