There is no such polygon because a polygon must have at least 3 sides or more.
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An n sided polygon has n*(n-3)/2 diagonals.
A polygon with n sides has n*(n-3)/2 diagonals. Simple as that. So a 9 sided polygon has 9*6/2 = 27 diagonals.
1/2*36*(36-3) = 594 diagonals.
100*(100-3)/2 = 4850
There are 44 diagonals in an 11-sided polygon. heres how to find the amount of diagonals: S=amount of sides 1/2 S(S-3)