Regular octadecagon.

Polygon with eighteen sides and eighteen vertices.

The sum of the internal angles of a octadecagon is 2880°2880\degree.

The area of a regular octadecagon is given by the formula:

Area=184a2cotπ18\text{Area}= \frac{18}{4} a^2 \cot{\frac{\pi}{18}}

where aa is the length of the side of the regular octadecagon.

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