Circle, triangle, oval, ellipse, & irregular shapes
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A rectangle is a shape that has four sides with two parallel lines.
None. A parallel is not a shape and so does not have any sides.
square
Any polygon with four or more sides can have a pair of parallel sides. It is also possible to to have non-polygonal shapes - eg a cigar-shape - that has parallel sides.
Any shape wit four of more sides can have one pair of parallel sides.