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If two sides of a triangle are congruent, then the angles opposite those sides are congruent. Converse: If two angles of a triangle are congruent, then the sides opposite those angles are congruent. Which sides are congruent? B A C Which sides are congruent? R T S Which sides are congruent? Z Y X Which angles are congruent? E F D Which angles are congruent? M N L Which angles are congruent? R Q S Find S Find C B R 50 Q 50 S A C Find XY Z Y 12 X Find x. Z Y 3x + 5 x+7 X Find x. B A (3x + 10) (6x - 20) C