$$\(15 P, Q\)$$ and $$\(R\)$$ are points on a circle, centre $$\(O\)$$. $$\(T R V\)$$ is the tangent to the circle at $$\(R\)$$. Reflex angle $$\(P O R=238^{\circ}\)$$ Angle $$\(Q R V=60^{\circ}\)$$ Calculate the size of angle $$\(O P Q\)$$. Give a reason for each stage of your working.

Answer:

Knowledge points:

Solution: