The amphitheater

The amphitheater has the shape of a semicircle, the spectators sit on the perimeter of the semicircle, the stage forms the diameter of the semicircle. Which of the spectators P, Q, R, S, T sees the stage at the greatest viewing angle?

Correct result:

A =  90 °


P=Q=R=S=T=90  A=90=90

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