An octagon has 16 diagonals.
5
8
0.5*(82-24) = 20 diagonals
Depends on the shape.
If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed
it really isn't hard 5
5 triangles are formed.
An octagon has 16 diagonals.
16 diagonals* * * * *5. To all vertices except itself and one each on either side.
5
40
8
0.5*(82-24) = 20 diagonals
It is 18 diagonals
3
Depends on the shape.