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A hendecagon is an 11-sided polygon.
Undecagon is incorrect — the prefix is properly Greek, not Latin.
A regular hendecagon has internal angles of 147.272727... degrees.
The area of a regular hendecagon with side length a is given by
- <math>A = \frac{11}{4}a^2 \cot \frac{\pi}{11} \simeq 9.36564 a^2.<math>
The interior design of the (US coin) Susan B. Anthony silver dollar is a hendecagon.
See also
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