Any curved shape such as a circle, an ellipse, an oval, a wriggly line - as long as it does not have any corners.
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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")
the shape has 1 side of symmetry
The only shape with one side is a circle. In geometry, a circle is defined as a shape that consists of all points in a plane that are a fixed distance, called the radius, from a given point, called the center. Since a circle is a curved shape with no angles, it can be said to have only one side, as there are no distinct edges or boundaries that separate it into multiple sides.
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).