A nineteen sided polygon is called a Nonadecagon or an Enneadecagon.
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The name of a 19 sided polygon is Enneadecagon.
The name of a 19 sided polygon is enneadecagon.
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.