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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