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Assertion \((A)\): The length of the minute hand of a clock is 8 \(cm\). Then the area swept by the minute hand in 5 minutes is 20.8\(cm^2\)
 
Reason \((R)\): The length of an arc of a sector of a angle '\(θ\)' and radius '\(r\)' is given by \(=\) l=θ360°2πr.