Rhombus (or square).
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A parallelogram.
It's possible for any polygon with an even number of sides to have 2 pairs of congruent and parallel sides.Every parallelogram, including all rhombera, rectangles, and squares, must have.
A polygon.
A quadrilateral with congruent pairs of adjacent sides and no parallel sides is a kite.
A kite is a four-sided polygon with two pairs of congruent adjacent sides.