Any shape wit four of more sides can have one pair of parallel sides.
A square
A polygon with 4 or more sides can have a pair of parallel sides.
A right hendecagon can have no parallel sides because there are eleven sides to a hendecagon. It is not a requirement that there be any pairs of parallel sides in an irregular hendecagon, although there could be one or more pairs.
Strictly speaking you cannot have one parallel side - you must have one pair. Any irregular polygon with four or more sides can have a pair of parallel sides. Most have no specific names - the only one that does is a trapezium.
Any plane polygon having four or more sides may have one pair of parallel sides.
square
The more common definition of a trapezoid (or trapezium, outside of North America) is a four-sided figure with exactly one pair of parallel sides. By this definition, figures with two sets of parallel sides such as a rectangle are nottrapezoids.Some mathematicians use a more general definition that allows for one or more pair of parallel sides. By this definition, a rectangle, square, or rhombus would be considered as special cases of a trapezoid.
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A trapezium or parallelogram. A pentagon can have a pair of parallel sides. Polygons with 6 or more sides can have two (or more) pairs of parallel sides.
Any polygon with four or more sides can have parallel sides.
Exactly one pair of parallel sides.
A trapezoid has only one pair of parallel sides. These parallel sides are opposite and are of different lengths.
A shape with four or more sides can have two parallel sides.
A trapezium. It has one set of parallel sides. It has four sides.
A trapezium (US) has no sides parallel, while a trapezoid has one set of unequal parallel sides.
All sides of an octagon are parallel to one other side. There are 4 sets of parallel sides.