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In the figure below, PR is a diameter of the circle centre O. Points P,Q, R and S on the circumference of the circle. Angle PRQ=`72^0`, QS=QP and line USV is a tangent to the circle at S

Giving reasons, calculate the
size of:
(a) `angle`QPR
(b) `angle` PQS
(c) `angle` OQS
(d) `angle` RTS
(e) `angle` RSV