High Quality Content by WIKIPEDIA articles! 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 Canadian dollar coin, the loonie, is similar to, but not exactly, a regular hendecagonal prism, as is the Indian two-rupee coin. It was also patterned on the Susan B. Anthony dollar of the United States from 1979-1981 and again in 1999.

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