Answers

2015-11-09T22:26:48+08:00
"Icosikaihenagon" is a proper denomination for a 21-sided polygon, according to ©Wikipedia
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However, I doubt that even a well-read mathematician would understand precisely what this word is referring to (apart perhaps if the said mathematician is Greek).

"21-gon" would be a much more intelligible designation
©Quora User
2015-11-13T10:52:34+08:00
Icosikaihenagon have 21sides
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