In geometry, a hendecagon (also undecagon) is an 11-sided polygon. The name "undecagon" is often seen as incorrect, but the matter is up for debate. The Greek prefix 'hen', is preferable to the Latin 'uni' or 'un' . A regular hendecagon has internal angles of 147.27 degrees. The area of a regular hendecagon with side length is given by A regular hendecagon is not constructible with compass and straightedge.
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