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we know that perpendicular drawn from centre of circle to the chord bisects the chord
PR=RQ=40UNITS
IN ∆OPR
OR²+PR²=OP²
=>OR²+40²=412
=>OR²=1681-1600
OR²81
therefore OR=9
distance =9 units
PR=RQ=40UNITS
IN ∆OPR
OR²+PR²=OP²
=>OR²+40²=412
=>OR²=1681-1600
OR²81
therefore OR=9
distance =9 units
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