Enneadecagon
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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
- <math>A = \frac{19}{4}a^2 \cot \frac{\pi}{19} \simeq 28.4652 a^2.<math>