One pair.
A square has two pairs of parallel sides.It has two pairs of parallel sides.
A parallelogram has two pairs of parallel sides.
It has 2 pairs of parallel sides
2There are two parallel sides....A rhombus has two pairs of opposite parallel sides.There are two parallel sides....A rhombus has two pairs of opposite parallel sides.
A parallelogram has two pairs of opposite parallel sides
Two pairs of opposite sides are parallel in a parallelogram
A parallelogram has 2 pairs of parallel sides
All parallelograms have two pairs of parallel sides.
There are infinitly many types. However some broad (and not necessaryly exclusive) classes of trapezia are Right trapezia (with at least 1 right angle) Isoceles trapeziea (the non parallel sides are equal in length) parallelograms (both pairs of sides are parallel)
It has 2 pairs of parallel sides
a pentagon has no parallel sides
A triangle has no parallel sides.