The name of a 19 sided polygon is enneadecagon.
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The name of a 19 sided polygon is Enneadecagon.
A nineteen sided polygon is called a Nonadecagon or an Enneadecagon.
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
The name of a 99 sided polygon is enneacontaenneagon.