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PQ is the chord of a circle whose centre is O. ROS is a line segment originating from a point R on the circle that intersect PQ produced at point S such that QS = OR. If $\angle QSR$ = $30^{0}$, then what is the value (in degrees)of $\angle POR$?
- A30
- B45
- C60
- D90
Answer not set