In the below figure find the value of ∠QOR. Given that ∠QSR=40∘ and O is the centre of the circle.
80∘
∠QPR=40∘ (Angles in the same segment of a circle are equal) ∠QOR=80∘ (the angle subtended by an arc at the centre is double the angle subtended by it at any point on the remaining part of the circle).