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Anonymous
There are: 0.5*(15^2 -3*15) = 90 diagonals in a 15-agon polygon
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It has 495 diagonals.
There are 119 diagonals.
It has 54 diagonals
170
78
1/2*15*(15-3) = 90 diagonals.
0.5*(152-45) = 90 diagonals
252 diagonals
fourteen. If you draw if diagonals from one vertex there are 14. fourteen. If you draw if diagonals from one vertex there are 14.
39*36/2 = 702 diagonals.
There are 44 diagonals in an 11 sided undecagon