Just one. And the other pair cannot be parallel.
1 pair of parallel line
A square has four pairs of parallel lines. Each pair consists of two opposite sides that run parallel to each other, resulting in a total of two pairs for the horizontal sides and two pairs for the vertical sides. Thus, the total is four pairs of parallel lines.
Two pairs.
Normally none but if it's an isosceles trapezoid it has one
2 pairs
1 pair of parallel line
None
One pair.
A square has four pairs of parallel lines. Each pair consists of two opposite sides that run parallel to each other, resulting in a total of two pairs for the horizontal sides and two pairs for the vertical sides. Thus, the total is four pairs of parallel lines.
Two pairs.
Normally none but if it's an isosceles trapezoid it has one
2 pairs
Two pairs.
2 pairs
2 pairs, same as any other parallelogram
none.
a rhombus has 4 equal sides