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A 29-sided polygon.
11
I think its: icosikaienneagon. I think it can help it.... :-D
The formula for the number of diagonals that an N-sided polygon has is# diagonals = N(N-3)/2N(N-3)/29(N-3)/29*(9-3)/29*6/2 = 54/227
A 9 sided polygon is a Nonagon.