14
There are 15 triangles in a 17-agon
There are N triangles in a N-gon
There are 48 triangles in a 50-gon polygon
There are: 13-2 = 11 triangles
There are: 23-2 = 21 triangles
There are 67-2 = 65 triangles
fourteen. If you draw if diagonals from one vertex there are 14. fourteen. If you draw if diagonals from one vertex there are 14.
There are 20
N
There are 11
1000