
The counterexample to show that parallelograms are not always congruent if their corresponding sides are congruent.

Explanation of Solution
According to SSS Congruence Postulate, for any two
And, two quadrilaterals are not essentially congruent if their four sides are congruent.
In the following parallelograms, there are 4 pairs of congruent sides but the parallelograms are not congruent themselves.
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