No. To be a polygon a figure must be "closed", that is, enclose an area. At least three line segments are required to enclose an area.
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A nine sided shape that is called a regular nonagon.
It is a regular 20 sided polygon
It is a six sided regular hexagon.
A four-sided regular polygon (square or rectangle) has 900 interior angles.
If the polygon is regular, the measure of one interior angle of a 24 side polygon is 165 degrees.