The minute hand of a clock is 2.1cm long. How far does its tip move in 20 minutes. [ use pie = 22/7 ]

Dear student
In 60 minutes, the minute hand of a watch completes one rotation i.e, it ratotes through 360'.Angle traced by the minute hand in 1 minute=36060°=6°Angle traced by the minute hand in 20 minutes=20×6°=120°=120×π180c=2π3cNow, θ=arcradius2π3=arc2.1arc=4.2π3cm=4.23×227cm=4.4cmHence the tip of the minute hand travels 4.4cm in 20 minutes.
Regards

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