The name of a 22 sided polygon is Icosidigon.
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The name of a 22 sided polygon is Icosidigon.
Using systematic polygon naming, a twenty-two sided polygon would be called an icosakaidigon.
The name of a 21 sided polygon is Icosihenagon.
A twenty sided polygon is called an icosagon - from the Greek words "icosi", meaning twenty, and "gonus", meaning angle, or knee.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.