In the diagram below, $$\(P\)$$ and $$\(Q\)$$ are points on a circle with centre $$\(O\)$$. Diagram NOT accurately drawn $$\(Q T\)$$ is a tangent to the circle. Angle $$\(O P Q=18^{\circ}\)$$ Work out the size of angle $$\(P Q T\)$$. Give a reason for each stage of your working. ○

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