Irregular polygons.
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They are quadrilateral shapes whose opposite sides are parallel. In a parallelogram, one pairs of parallel sides may be of a different length to the other pair; in a rhombus all four are the same length.
Since by definition corresponding sides of congruent shapes have the same length, the answer is 1.
No, a parallelogram cannot be a hexagon. A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length, while a hexagon is a polygon with six sides. These are two different shapes with different numbers of sides.