To use the SSS (Side-Side-Side) Congruence Theorem to prove that triangles \( \triangle KLM \) and \( \triangle MNK \) are congruent, you need to show that all three corresponding sides of the triangles are equal in length.
The question asks for what additional piece of information would be needed to establish this congruence. Among the options provided:
- \( \overline{KM} \cong \overline{KN} \)
- \( \overline{KL} \cong \overline{MN} \)
- \( \overline{NL} \cong \overline{KM} \)
- \( \overline{KL} \cong \overline{LM} \)
To specifically use the SSS theorem effectively, you would need to know the length of one of the sides that connects these two triangles.
Option 1, stating \( \overline{KM} \cong \overline{KN} \), provides the necessary information related to the sides of triangles \( KLM \) and \( MNK \) to verify the SSS condition.
Thus, the additional piece of information needed is:
\( \overline{KM} \cong \overline{KN} \).