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It has 9 sides and it can be an regular or a irregular polygon which is called a nonagon Check: 0.5*(81-27) = 27 diagonals
a "regular" one
That regular polygon would have 9 sides.
It is an equilateral polygon. It is not a regular polygon. For the polygon to be regular, it is not enough for the sides to be congruent: all the angles need to be congruent as well.
A polygon whose sides are all equal is known as a regular polygon. Some examples include squares and equilateral triangles.