104
16x ((16-3)/2) =104
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There are 44 diagonals in an 11 sided undecagon
There are: 0.5*(302-(3*30)) = 405 diagonals
1/2*15*(15-3) = 90 diagonals.
If you mean "How many diagonals can be drawn from one vertex of a figure with 16 sides", the formula is n-3, where "n" being the number of sides of the figure. So 16-3 = 13 diagonals that can be drawn from one vertex.
22-gon