Final answer:
Congruent triangles are pivotal in demonstrating that the opposite sides of a parallelogram are congruent.
Explanation:
Congruent triangles are used to prove that the opposite sides of a parallelogram are congruent. When two triangles have three sides of one equal, respectively, to three sides of the other, they are considered congruent. This property is utilized to show that the opposite sides of a parallelogram are of equal length.
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