semms like 10 not sure
An octagon has 16 diagonals.
4 diagonals
An octagon has four (4) diagonals, each connecting two opposite vertices.
None, if it is an irregular octagon.
An octagon has 8 sides and 20 diagonals so the question doesn't make sense
both are parallel
An octagon has 16 diagonals.
An octagon need not have any parallel sides. But it can have any number from 2 to 8 lines that are parallel - in pairs, triplets or quartets.
There are 20 diagonals
20 diagonals
An octagon can have up to four pairs of parallel sides, but it need not have any.
8 diagonals
4 diagonals
No, they do not.
20
It can, but it need not.
An octagon has four (4) diagonals, each connecting two opposite vertices.