0
Anonymous
a triangle has 0 diagnols
Wiki User
8
2
35
44
None
A polygon with n sides has n*(n-3)/2 diagonals (not diagnols!).So, an octagon has 8*5/2 = 20 of them.
3
six
no
It is an octagon
It has: 0.5*(100^2-(3*100)) = 4850 diagonals