What is the name of a quadrilateral with pairwise parallel sides?

A quadrilateral with pairwise parallel sides is called a parallelogram. In this case, the sides are not only pairwise parallel, but also pairwise equal, as are the opposite angles of the figure. Special cases of a parallelogram are rectangle, square and rhombus. A rectangle and a square have right angles between the sides, while all sides of the square are equal. A rhombus, like a square, has equal sides, and opposite angles are equal in pairs.



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