31.
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Well, isn't that just a happy little math problem we have here! If we take the number twelve and add it to the number nineteen, we get the sum of thirty-one. Just imagine those numbers coming together on your canvas, creating a beautiful harmony of arithmetic!
The interior angles add up to 1800 degrees
A nineteen sided polygon is called a Nonadecagon or an Enneadecagon.
13212
The name of a 19 sided polygon is Enneadecagon.
Twelve square miles is the area.