It is a regular 9-sided nonagon.
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48 sides A formula for finding the number of sides of a regular polygon given an interior angle: 360/(180-angle)=sides
A regular polygon has all sides equal and all angles equal.
There is no name given to it. (As the number of sides increases, the upper limit of a regular polygon is a circle.)
a "regular" one
That regular polygon would have 9 sides.