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In the given figure bar(PQ) is a line. ...

In the given figure `bar(PQ)` is a line. Ray `bar(OR)` is perpendicular to line `bar(PQ) . bar(OS)` is another ray lying between rays `bar(OP) `and `bar(OR)` . Prove that `angleROS = (1)/(2) angleQOS − anglePOS`

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