Most mathematicians use "100-gon." Hectogon and centagon are also permissible.
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Any of these shapes is practically circular. A 20-sided shape is an icosagon. a 50-sided shape is a pentacontagon (aka pentecontagon). A 100-sided shape is a hectogon (aka hecatontagon). A 1000-sided shape is a chiliagon.
Zillion is a nonsense word that implies many. It is not a number.
A 100-sided shape is called a hectagon.
Octagon.
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