Answer:
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If you add a parallel line through the point Q, then angle TQR will be divided by two angles.
One of them is congruent to ∠STQ and another one is congruent to ∠PRQ as alternate interior angles.
Therefore:
- m∠TQR = m∠STQ + m∠PRQ
- m∠TQR = 45° + 35°
- m∠TQR = 80°