It's perfectly acceptable to call it a 1999-agon but what's more important is knowing how to work out its properties.
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A polygon with 5 sides is called a pentagon.
the 11th sides of polygon is called UNDECAGON....... the 12th sides is DODECAGON.....
It is known as a regular polygon that has equal sides of the same lengths.
Just call it a "24-sided polygon".
A polygon with four equal angles and sides is a square.