For a shape to have parallel sides it needs at least 4 sides
A trapezoid is a shape that has 4 sides and 2 parallel sides. The sides that are parallel are called the bases.
A 25-sided shape would have no parallel sides !
A rectangle is a shape that has four sides with two parallel lines.
If it has four equal sides, then two parallel sides implies two PAIRS of parallel sides. The shape is a rhombus.
Any polygon with four or more sides can have parallel sides.
shape no pairs of perpendicular sides
A square and a Rectangle both have parallel sides.
None. A parallel is not a shape and so does not have any sides.
A geometric shape with only one set of parallel sides is a trapezoid.