Figure.
What are the pairs of congruent angles?
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∠QRS and ∠CDE are congruent.
∠RST and ∠DEB are congruent.
∠STQ and ∠EBC are congruent.
∠TQR and ∠BCD are congruent.
You can conclude the above angles are congruent because ∠R and ∠D has the same sign on their angle and so does ∠S and ∠E.
Answer:
angle Q,T,C, and B are right (90°)
angle D = R (from the sign)
angle E = S (from the sign)