Because if they were parallel but not equal, the other two sides would not be parallel.
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In parallelogram each two opposite sides are parallel and equal in length
Congruent (equal in length), and parallel.
NO!!!! A parallelogram is a polygon of four sides. The opposite sides are parallel and equal in length.
Yes. A parallelogram is defined as having opposite sides that are parallel and equal in length, and opposite angles that are equal.
A parallelogram.