1 pair
It has 2 pairs of equal opposite parallel sides
NoneOctagon hasn't got any pairs of parallel line
Two pairs.
4
If it's a 'regular' hexagon, then it has three pairs of parallel lines. If the hexagon isn't 'regular', then it's not possible to answer the question with the information given in it.
None
None
2 --Algebra 2 Teacher
2
It can have none, one, two or three pairs.
Only one pair is parellel.