Top Answer

20 diagonals For any n-sided polygon, the formula for the number of diagonals is (n/2) x (n-3), so for an octagon it is (8/2) x (8-3) = 4 x 5 = 20.

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An octagon has 16 diagonals.

There are 20 diagonals

8 diagonals

4 diagonals

None, if it is an irregular octagon.

20

20

An octagon has four (4) diagonals, each connecting two opposite vertices.

there are 5, 6, or 7 diagonals in a pentagon

Sides: 8 Diagonals : 20

A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.

8

0.5*(82-24) = 20 diagonals

An octagon has 8 sides and 20 diagonals so the question doesn't make sense

There are 20 diagonals in an octagon.

There are 20 diagonals in an 8 sided octagon

It has 20 diagonals and is made up by 6 triangles

40

0 thick head

5

20 diagonals

A polygon with n vertices has n*(n-3)/2 diagonals. So an octagon has 8*5/2 = 20 diagonals. Of those 20 diagonals, 8 are the principal diagonals, the ones joining a pair of opposite vertices

No, they do not.

octagon

Yes, four of them.