Triskaidecagon
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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
- <math>A = \frac{13}{4}a^2 \cot \frac{\pi}{13} \simeq 13.1858 a^2.<math>
A regular triskaidecagon is not constructible with straightedge and compass.
The current flag of the country Bahrain has a red field that is a triskaidecagon.