hectogon, centagon
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The name of a 100 sided polygon is Hectogon.
While a 100-sided polygon has no official name, the most commonly used terms are "hectogon" and "centagon".
This may sound funny, but it is actually called a 100-agon.
I find the name "30-sided polygon", "40-sided polygon", etc. just fine.
A 100-sided polygon