Presumably, that would be a polygon with a hundred sides. Although it would probably be understood if you used it, "centi-" really means "one-hundredth" rather than "one hundred," so it would be better to call such a figure a "hectogon."
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Most mathematicians use "100-gon." Hectogon and centagon are also permissible.
Most mathematicians use "100-gon." If you want to show off, use hectogon or centagon.
It is called a megagon. A ∞ sided shape is called an apeirogon.
The 22 sided shape is called a: ICOSIKAIDIGON
Hommasquabblelagagon