Enneadecagon, or also known as Enneakaidecagon.
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A 19 sided polygon is called an enneakaidecagon.
A 19-sided polygon is an enneadecagon (also enneakaidecagon or nonadecagon).
The name of a 19 sided polygon is Enneadecagon.
icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon
The name of a 19 sided polygon is enneadecagon.