A "n-gon" has n sides.
n-gon is a generic term to mean a polygon with 'n' sides where the 'n' is any whole number greater than 3.
Examples:
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10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
heptagons have 7 sides
10 sides
4 sides.