It can be a trapezium, parallelogram, rhombus, rectangle or square.
Any polygon with four or more sides can have perpendicular and parallel lines.
parallelogram
Any polygon with four or more sides can have parallel lines. So also can some irregular shapes.
A decagon has 10 sides. Any regular polygon with four or more sides will have pairs of sides that are parallel. A decagon will have 5 pairs of parallel sides.
Any polygon with more than 3 sides can have two pairs of parallel sides.If it has only four sides and they make two parallel pairs, then it's a parallelogram.
-- A trapezoid always has.-- Any polygon with more than four sides can have, but doesn't always.
A square is a four-sided polygon with two congruent parallel sides.
Any polygon with four or more sides can have parallel sides.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
A decagon has 10 sides. Any regular polygon with four or more sides will have pairs of sides that are parallel. A decagon will have 5 pairs of parallel sides.
quadrilateral
The four sides are NOT parallel. If the fours sides were parallel , it would NOT be a polygon., but just four lines. The opposite sides are parallel. Being the same length, it could be either a 'SQUARE' or a 'RHOMBUS'. The difference being that the square has four right angles (90 degrees)-. A Rhombus has the opposite angles the same, but not a 90 degrees.