1. Let's clarify the RHS (Right angle-Hypotenuse-Side) theorem. It states that if two right-angled triangles have their hypotenuse and one corresponding side equal, then the triangles are congruent. 2. To use the RHS theorem, you must first confirm that the triangles have a right angle (90 degrees). 3. Next, verify that the hypotenuse (the side opposite the right angle) is equal in both triangles. 4. Finally, check that one other side (not the hypotenuse) is equal in both triangles. 5. If all these conditions are met, you can conclude the triangles are congruent by the RHS theorem. 6. This theorem is useful because it allows you to prove triangle congruence without needing to check all sides or angles. 7. Remember, the right angle is crucial; without it, the RHS theorem does not apply. 8. So, if the angles you mentioned are indeed 90 degrees, and the hypotenuse and one side match, then using the RHS theorem is correct.