Poly means "many". Polygon is "many sides" (literally "many angles").
"Poly" is also used in several other words with the same meaning, like polygamy (many marriages) and polytechnic (many technical fields).
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Greek: "poly-" from polus, meaning many. "gon" from gonia, meaning angle. Hence, many angles and implicitly many sides.
A line?? It's impossible to have a polygon with only one side, hence the "poly" meaning many.
Dodeca, meaning twelve... in the word octagon 'octa' (eight) is the prefix, polygon 'poly' (many) and so on. These prefixes come from ancient Greek.
It means angle or corner. (poly gon - many angled)
well poly means more than one or many ( such as polynomial, polygamy) so a polygon is a shapewith many sides.