1. The problem asks us to identify which two triangles are congruent by the SSS (Side-Side-Side) Theorem and to complete the congruence statement. 2. The SSS Theorem states that if three sides of one triangle are congruent to three sides of another triangle, then the two triangles are congruent. 3. From the description, triangles QRS and WXY each have three pairs of sides marked congruent. 4. Therefore, by the SSS Theorem, triangle QRS is congruent to triangle WXY. 5. The congruence statement is: $\triangle QRS \cong \triangle WXY$. This means all corresponding sides and angles of these two triangles are equal.