Icosagon
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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
- <math>A = 5a^2 \cot \frac{\pi}{20} \simeq 31.5688 a^2.<math>
Notable icosagons include the swastika.