Explanation:
Since triangle GHJ is rotated 90 degrees about point X, it undergoes a rigid motion, which means that the length and angles of its sides remain unchanged. Therefore, triangle GHJ is congruent to triangle STR, meaning that every side and angle of triangle GHJ is congruent to the corresponding side and angle in triangle STR.
So, the correct congruency statement is:
GHJ ≡ STR (Congruent)