A irregular nonagon is a polygon that is not a regular polygon.
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Any regular polygon of n sides, has an order of symmetry of n. Therefore, since a nonagon has nine sides, a nonagon has an order of symmetry of 9.
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
nonagon
A nonagon is a 2D shape so you cannot make a 3D nonagon!
a nine sided polygon is called a nonagon.