Hi there,
sas congruent theorem is a criterion in which if side ,angle and another side is given the 2 triangles will be congruent.
i hope this helps u...
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this congruency theorem states that :

1. in 2 triangles to congruent their 2 sides in three should be equal

2. and including the sides  there should be an angle which is same in both the triangle

3. if two sides and one angle are same then these 2 triangles which are taken under consideration are named as congruent by side angle side property/theorem.

hope so my answer is useful   
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