A polygon that has 209 diagonals will have 22 sides and it's perfectly acceptable to call it a 22-agon.
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It is a polygon with 22 sides (or vertices). The best way to refer to one is to call it a 22-gon, but you an be unhelpful and pretentious and call it an icosikaidigon.
22-gon
It is an undecagon which has 11 sides Check: 0.5*(112-33) = 44 diagonals
There are 90 diagonals in a 15-sided polygon.
It has 40 diagonals.Improved Answer:-Using the formula for diagonals of a polygon: 0.5*(442-132) = 902 diagonals
It is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon