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A polygon with 6 sides is called a hexagon.
A polygon with 12 sides is called a dodecagon.
It has 14 sides! The regular polygon with 14 sides is called a tetradecagon.
On the internet I found that a polygon with seven sides is called a heptagon.
Shapes with 13 to 20 sides are known as polygons. Specifically, a 13-sided polygon is called a tridecagon, a 14-sided polygon is called a tetrakaidecagon, a 15-sided polygon is called a pentadecagon, a 16-sided polygon is called a hexadecagon, a 17-sided polygon is called a heptadecagon, an 18-sided polygon is called an octadecagon, a 19-sided polygon is called an enneadecagon, and a 20-sided polygon is called an icosagon.