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")
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the shape has 1 side of symmetry
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).
Any curved shape such as a circle, an ellipse, an oval, a wriggly line - as long as it does not have any corners.
Cone....
Extend any straight side of a shape. The angle made by that side with the adjacent side of the shape is an exterior angle. Its value is 180 degrees less the interior angle.