What shape has two pairs of parallel sides?

Answer 1

A square

Answer 2

Any polygon with any even number of sides CAN have 2 pairs of parallel lines. Parallelograms, rhombuses, rectangles, and squares always do.

The shape that has two pairs of parallel sides is a parallelogram. It is either a rectangle, rhomboid, square, or rhombus (all special cases of the parallelogram)

The set of parallelograms is is often confused with the set of trapezoids. Trapezoids are a little confusing in themselves because, although mathematicians world-wide define them as quads with two (and only two) parallel sides, in Britain trapezoid is sometimes used to refer to a quad with no parallel sides. ref. Merriam-Webster's Collegiate Dictionary.

Answer 3

Every parallelogram ... including every rhombus, rectangle, and square ...

must have two pairs of parallel lines.

Any shape with more than four sides can have 2 pairs of parallel sides,

but it doesn't necessarily have to.

Answer 4

A square is one example that has two pairs of opposite parallel sides.

Answer 5

All parallelograms have. (That includes rhombuses, rectangles, and squares.)

Any other polygon with any even number of sides can also manage that.