This assumes you mean a regular octagon.
There are 4 pairs where the diagonals each skip two vertices.
Then there are 4 sets of three parallel diagonals where one is the main diagonal (skips three vertices) and two skip just one vertex. For each of these sets of three, you can choose three pairs of two. That makes 12 pairs all up.
So there are 4 + 12 = 16 pairs.
A regular octagon has four pairs of parallel lines.
A regular octagon has four pairs of parallel sides.
An octagon can have 0, 2, 3, 4, 5, 6, 7 or 8 parallel sides. A regular octagon has 4 pairs of 2 parallel sides, (8 parallel sides in all).
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
A regular octagon has four pairs of parallel lines.
An octagon had four pairs of parallel lines.
4 pairs
A regular octagon has four pairs of parallel sides.
4
A regular octagon has 4 pairs but it need not have any.
4
An octagon can have 0, 2, 3, 4, 5, 6, 7 or 8 parallel sides. A regular octagon has 4 pairs of 2 parallel sides, (8 parallel sides in all).
Four pairs.
An octagon has 16 diagonals.
NoneOctagon hasn't got any pairs of parallel line
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.