20 diagonals
Octagons have no perpendicular lines.
There are 64 sides in eight octagons.
Vertices don't have octagons but octagons have vertices. Assuming this is what you meant, 8.
alot
64.
It has 1,345,890 diagonals
24 sides
24 diagonals
2 diagonals
It has 2 Diagonals!!!
There are 20 diagonals
It has 2 diagonals