Answer: The SSS postulate would be those three letters.
Step-by-step explanation:
Here's how I got my answer:
Since you know that two pairs of sides are congruent and that the two triangles lie on the same side, then you can conclude that all three pairs of sides are congruent. Therefore, use the SSS postulate (Side-Side-Side) as the proof that the two triangles are congruent.
