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{{ printedBook.courseTrack.name }} {{ printedBook.name }} To prove triangle congruence by the SAS Congruence Theorem, we need two pairs of congruent sides and congruent included angles. Consider the given diagram.

We see that $LM$ $≅$ $OQ ,$ and that $MO$ $≅$ $QP .$ Moreover, $∠M$ and $∠Q$ are both right angles and hence they are congruent. Therefore, we have two pairs of congruent sides and one pair of congruent included angles. We can conclude that $△LMO$ $≅$ $△OQP$ by the SAS Congruence Theorem.