A polygon with 4 or more sides can have a pair of parallel sides.
quadrilateral
polygon
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.
A parallogram has two pairs of parallel sides. A trapezoid has one pair of parallel sides. A regular octagon has four pairs of parallel sides. An irregular octagon may have from 3 pair to no pair of parallel sides.
Any regular polygon of 2n sides where n>2.
A polygon with 4 or more sides can have a pair of parallel sides.
quadrilateral
polygon
A kite for example.
rhombus
Trapezoid
It is a deltoid or a kite.
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 plane polygon having four or more sides may have one pair of parallel sides.
A parallogram has two pairs of parallel sides. A trapezoid has one pair of parallel sides. A regular octagon has four pairs of parallel sides. An irregular octagon may have from 3 pair to no pair of parallel sides.
Trapezoid. It has two parallel lines on opposite sides.