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 ∠QSR = 30°, then what is the value (in degrees)of POR?
The United Nations (UN)'s World Television Day is observed across the globe on November 21 to recognize the increasing impacts of television on decision making and to focus on the issues like economic and social issues.