Icosogon
It has 1,345,890 diagonals
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
24 diagonals
2 diagonals
It has 2 Diagonals!!!
There are 20 diagonals
20 diagonals
It has 27 diagonals
14 diagonals
It has 9 diagonals
It has 2 diagonals