Trapezoid
Any polygon can have only 1 pair of perpendicular sides.
Trapezoids have only one pair of parallel sides.
A parallelogram, or variants of polygons with 6 or more sides.
in geometry i learned a parallelogram has only 2 pairs of parallel sides each pair of opposite sides is parallel
a trapezoid is the only quadrilateral that has exactly 1 pair f parallel sides.
rhombus
A polygon with 4 or more sides can have a pair of parallel sides.
quadrilateral
polygon
A circle intersected by a pair of parallel lines.
A kite for example.
It is a deltoid or a kite.
A four-sided shape is a quadrilateral. With only one pair of parallel sides, it would be called a trapezoid (UK trapezium).
A trapezoid is not a parallelogram, a trapezoid is a polygon. The definition of parallelogram is a shape in which all sides are parallel. In a trapezoid, only one pair of sides is parallel.
diamond trapezium
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.