A 9-sided polygon is most commonly called a nonagon. Since the names of polygons are derived from the Greek numbers and nonagon is derived from the Latin, the word "enneagon" might be considered to be more correct, but it is rarely used.
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a polygon with 9 sides is called a nonagon
its called a nonagon.
A nonagon is a polygon with 9 sides
A polygon with 3 sides is called triangle A polygon with 4 sides is called quadrilateral A polygon with 5 sides is called pentagon A polygon with 6 sides is called hexagon A polygon with 7 sides is called heptagon A polygon with 8 sides is called octagon
If the measure of an interior angle of a regular polygon is 140o, the polygon is a nonagon (sometimes called an ennagon) having 9 sides.