It is an undecagon which has 11 sides
Check: 0.5*(112-33) = 44 diagonals
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It has 40 diagonals.Improved Answer:-Using the formula for diagonals of a polygon: 0.5*(442-132) = 902 diagonals
There are 90 diagonals in a 15-sided polygon.
It is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon
it has 44 diagonals :D
A polygon that has 209 diagonals will have 22 sides and it's perfectly acceptable to call it a 22-agon.