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In the figure above, PQRS is a parallelogram. The measure of ∠PQT is 50°, and the measure of ∠PTQ is 70°. What is the measure of ∠QRS?
- A60°
- B70°
- C80°
- D120°
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Correct answer: A
Find the missing angle, angle QPT, of triangle PQT:
180° − 70° − 50° = 60°
In parallelogram PQRS, angle QPT is congruent to angle QRS, so the measure of angle QRS is also 60°.