It is a nonagon
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A nonagon is a polygon that has 9 sides and 9 angles
The number of sides of an n-sided polygon is also the number of angles of that polygon. Nonagons have 9 sides, so 9 angles.
A nonagon is a 9 sided polygon having 9 interior angles
A 9-gon is a polygon with nine sides and nine angles
A polygon has the same number of sides as angles. And, this is always so, not just usually.