エンデカ 定義
A endecagon otherwise referred to as a undecagon, hendecagon 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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“Hendecagon.” Wikipedia, Wikimedia Foundation, 1 Apr. 2020, en.wikipedia.org/wiki/Hendecagon.
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