From Ancient Greek εἰκοσάγωνος (eikosagōnos, “having twenty sides”), from εἴκοσι (eikosi, “twenty”) + γωνία (gōnia, “angle”).
"icosagon." YourDictionary, n.d. Web. 10 November 2018. <https://www.yourdictionary.com/icosagon>.
icosagon. (n.d.). Retrieved November 10th, 2018, from https://www.yourdictionary.com/icosagon
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