In Geometry, a triskaidecagon is a polygon with 13 sides and angles. The measure of each internal angle of a regular triskaidecagon is approximately 152.308 degrees, and the area with side length a is given by

$A\; =\; \backslash frac\{13\}\{4\}a^2\; \backslash cot\; \backslash frac\{\backslash pi\}\{13\}\; \backslash simeq\; 13.1858\; a^2.$

A regular triskaidecagon is not constructible with compass and straightedge. However, it is constructible using a Neusis construction.

The current flag of the country Bahrain has a red field that is a triskaidecagon.

Polygons

Triscaidecágono