There are 44 diagonals in an 11 sided undecagon
There are: 0.5*(302-(3*30)) = 405 diagonals
104 16x ((16-3)/2) =104
22-gon
A n sided figure has 1/2 n(n - 3) diagonals → a 17-gon has 1/2 x 17 x (17 - 3) = 1/2 x 17 x 14 = 119 diagonals
0.5*(152-45) = 90 diagonals
There are: 0.5*(15^2 -3*15) = 90 diagonals in a 15-agon polygon
There are: 0.5*(15^2 -3*15) = 90 diagonals in a 15-agon polygon
252 diagonals
There are 119 diagonals.
It has 495 diagonals.
It has 54 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.
170
78
There are 44 diagonals in an 11 sided undecagon
A 20 sided polygon has 170 diagonals