the shape has 1 side of symmetry
A trapezoid which is also called a trapezium depending where you live.
A shape cannot have only one side because it would not be closed. A shape must have at least three sides to be a closed figure (no "gaps")
a Hecatommyriagon
Trapezium
No shape has only 1 parallel side. A trapezoid is a 4-sided shape, or quadrilateral, with only 2 parallel sides; it does not necessarily have to have 2 right angles. (In the UK a trapezoid is called a trapezium.) In North America, a trapezium is a quadrilateral with 0 (no) parallel sides.
Any four-sided shape is a Quadrilateral. Square, Rectangle, Parallelogram, rhombus, trapezoid etc. It may have no parallel sides as in a kite, 1 parallel side as in trapezoid or 2 parallel sides as in parallelogram.
trapezoid
Not sure how you can have only one parallel side. What is it parallel to?
the shape has 1 side of symmetry
If you mean shape there is no such shape. if a 4 sided shape has 2 right angles it MUST be either a square or a rectangle, in which case there are actually 4 right angles and 2 pairs of parallel sides. =)
A trapezoid which is also called a trapezium depending where you live.
There is no such thing as a 1 sided shape nor a two sided shape.
A trapezoid would fit the given description
a one sided shape is called a henagon and a 2 sided shape is called a digon
If you mean one pair of parallel lines, then you're talking about a trapezoid.
a 2 sided shape is real but a 1 sided shape is not