A 111-sided polygon is called a "hectadecagon." The naming convention for polygons follows the Greek numerical prefixes, with "hecta-" representing 100 and "deca-" representing 10. Therefore, combining these prefixes gives us "hectadecagon" for a 111-sided polygon.
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A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A 12-sided polygon is called a dodecagon.
A 20-sided polygon is called an icosagon.
A million-sided polygon is called a megagon.
A 90-sided polygon is called an enneacontagon.