They are the pairs of sides which are parallel.
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The opposite sides in a parallelogram are parallel and the same length. However, they are not angles at 90 degrees (right angles).
a parallelogram has parallel opposite sides and its opposite angles are congruent
Every quadrilateral has 2 pairs of opposite sides and so it is not clear what the question is about.
A parallelogram has two pairs of parallel sides.
NO!!!! A parallelogram is a polygon of four sides. The opposite sides are parallel and equal in length.
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