1 pair
NoneOctagon hasn't got any pairs of parallel line
2
Normally 1 pair
Just one. And the other pair cannot be parallel.
None
Only one pair is parellel.
2
It depends on where you are. If in the USA, a trapezium has no parallel sides. For everywhere else, a trapezium has one set of parellel sides (which is called a trapezoid in USA).
It has 2 pairs of equal opposite parallel sides
Can have no pairs or one pair...
NoneOctagon hasn't got any pairs of parallel line
One pair
2
1 pair of parallel lines
Normally 1 pair
A trapezoid is a four sided quadrilateral that has only one pair of opposite parallel lines of different lengths.
A trapezoid has one pair of parallel sides. They are opposite parallel lines of different lengths.