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The minute hand of a watch is 1.5 cm lo...

The minute hand of a watch is 1.5 cm long. How far does its tip move in 40 minutes? (Use `pi=3. 14`).

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`r = 1.5cm`
`l = r beta`
`l = r beta`
`beta = `angle in radian
`60min = 2 pi `radian
`40 min = (2 pi)/60*40 = 4 pi/3 `radian
so `l = r. beta`
`= 1.5 * 4 pi/3`
...
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