1/2*15*(15-3) = 90 diagonals.
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
It has 495 diagonals.
There are 119 diagonals.
It has 54 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.
In a 15-gon, each vertex can connect to other vertices to form diagonals. Specifically, a vertex can connect to (15 - 3 = 12) other vertices (excluding itself and its two adjacent vertices). Therefore, from one vertex of a 15-gon, 12 diagonals can be drawn.
170
78
There are 275 diagonals in a 25 sided polygon