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POQ is a line. Ray OR is perpendicular to line PQ. OS isanother ray lying between rays OP and OR. Prove that∠ROS = 1/2(∠QOS −∠POS)




        qr ⊥ pr 
to prove,
PROOF:  ∠por=90 
                ⇒∠ros=90-∠ pos---------------(1)
                ⇒∠ros=∠qos-90--------------------(2)                                                        from (1) and(2)we get,

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