From Ancient Greek εἰκοσιέν (eikosien, “twenty one”) + -gon.
"icosihenagon." YourDictionary, n.d. Web. 14 October 2018. <http://www.yourdictionary.com/icosihenagon>.
icosihenagon. (n.d.). Retrieved October 14th, 2018, from http://www.yourdictionary.com/icosihenagon
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