Hendecagon Definition
A hendecagon otherwise referred to as a undecagon, endecagon or 11-gon in geometry is an eleven sided polygon. The name hendecagon, from Greek hendeka which means eleven and gon meaning corner, is often preferred to the hybrid undecagon, whose first part is formed from Latin term undecim for eleven.
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Sources
“Hendecagon.” Wikipedia, Wikimedia Foundation, 1 Apr. 2020, en.wikipedia.org/wiki/Hendecagon.