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Wikipedia definition
1. HendecagonIn geometry, a hendecagon (also undecagon) is an 11-sided polygon. (The name hendecagon, from Greek hendeka "eleven" and gon– "corner", is often preferred to the hybrid undecagon, whose first syllable un– is Latin for "one".)
Read “Hendecagon” on English Wikipedia
Read “十一角形” on Japanese Wikipedia
Read “Hendecagon” on DBpedia

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