There are 20 diagonals
8 diagonals
20
there are 5, 6, or 7 diagonals in a pentagon
Sides: 8 Diagonals : 20
8
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
40
20 diagonals
No, they do not.
no
octagon