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1. \(AD\) is a diameter of a circle and \(AB\) is a chord. If \(AD = 30 \ cm\) and \(AB = 24 \ cm\), then the distance of \(AB\) from the centre of the circle is:
2. 
In the given figure, if \(OP = 17 \ cm\), \(PQ = 30 \ cm\) and \(OS\) is perpendicular to \(PQ\), then \(RS\) is:
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