There are 44 diagonals in an 11 sided undecagon
Chat with our AI personalities
There are 10 possible diagonals drawn from one vertex of the 13-gon which divide it into 11 nonoverlapping triangles.
There are: 0.5*(302-(3*30)) = 405 diagonals
1/2*15*(15-3) = 90 diagonals.
104 16x ((16-3)/2) =104
22-gon