A parallelogram is a quadrelateral with opposite sides parallel and congruent.
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Yes, the opposite sides of a parallelogram are congruent.
A parallelogram.A parallelogram.A parallelogram.A parallelogram.
A rhombus (4 congruent sides, diagonals perpendicular)that is not also a square (no right angles), andis also a parallelogram (opposite sides parallel and congruent, opposite angles congruent). It is also a quadrilateral, which has 4 sides.
Both pairs of opposite sides need to be congruent (the same length).
A parallelogram cannot have only two congruent sides, nor only two congruent angles.