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It's quite acceptable to call it a 100-agon or a 200-agon but what's more important is knowing how to work out their properties
The name of a polygon with 15 sides is a pentadecagon
A pentagon is the polygon with 5 sides.
A polygon with seven sides is a heptagon.
A regular polygon
A polygon can have any number of sides above three. The name of a three-sided polygon is a triangle.