Side-Side-Side (SSS) RULESide-Side-Side is a rule USED to prove whether a given set of triangles are congruent.The SSS rule states that:If THREE sides of ONE triangle are equal to three sides of another triangle, then the triangles are congruent.In the diagrams below, if AB = RP, BC = PQ andCA = QR, then triangle ABC is congruent to triangle RPQ.
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