252 diagonals
0.5*(152-45) = 90 diagonals
There are 275 diagonals in a 25 sided polygon
many triangles does a regular 46-gon have
189
A 20 sided polygon has 170 diagonals
170
20 20
252 diagonals
There are 119 diagonals.
It has 495 diagonals.
It has 54 diagonals
78
There are 44 diagonals in an 11 sided undecagon
0.5*(152-45) = 90 diagonals
There are 275 diagonals in a 25 sided polygon
39*36/2 = 702 diagonals.