It could be a trapezium, or an irregular pentagon, hexagon, heptagon etc.
trapezoid
trapezium
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.
It is a trapezoid which has 1 pair of opposite parallel sides of different lengths
It is not possible to have 1 parallel side since it must be parallel to another side. A four sided shape with 1 PAIR of parallel sides is a trapezium (or trapezoid).
If you mean one pair of parallel lines, then you're talking about a trapezoid.
A shape with only one pair of perpendicular sides is typically a right trapezoid (or right-angled trapezium). In this shape, one pair of opposite sides is parallel, while the other pair consists of one side that is perpendicular to the parallel sides. This configuration creates a right angle between the non-parallel side and one of the parallel sides. As a result, it has distinct geometric properties, including one right angle.
A trapezoid has 4 sides with one pair of opposite parallel sides of different lengths.
An isosceles trapezoid.
Yes, it is possible for a shape to have at least one pair of parallel lines and no lines of symmetry. For example, an irregular trapezoid has one pair of parallel sides but lacks any lines of symmetry due to its uneven angles and side lengths. This demonstrates that parallel lines and symmetry are independent properties in geometric shapes.
a rectangle, which has two sets of parallel side
A trapezoid would fit the given description which has only 1 pair of parallel sides of different lengths