360/9 = 40 degrees
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An equilateral triangle is the only polygon in which the exterior angle is larger than the interior angle. They are equal in a square and smaller in all regular polygons with more sides,
It will have 9 equal sides.
A nine sided nonagon is only a regular shape if it has 9 equal sides
Then it will have 9 equal sides.
In a regular nonagon there are 9, if its irregular its dependant.