In the adjoining figure. POQ is the diameter of the circle. R and S are any two points on the circle. Then,
∠PRQ > ∠PSQ
∠PRQ < ∠PSQ
∠PRQ = ∠PSQ
∠PRQ =1/2 ∠PSQ
∠PRQ = ∠PSQ = 90∘ (Angles in a semi-circle)