angles diagnal from each other in a parallelogram are congruent
for shape be parallelogram, all sides must be parallel
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No. In a parallelogram, opposite angles are congruent.
Yes, opposite angles of a parallelogram are congruent.
the opposite angles are congruent
In all parallelograms, opposite angles and opposite sides are congruent. If all four sides are congruent, it's a rhombus. If all four angles are congruent, it's a rectangle. If all four sides and all four angles are congruent, it's a square.
If both pairs of opposite angles of a quadrilateral are congruent, then it is a parallelogram.