the minute hand of watch is 1.5 cm long . how far will its tip moe in 40 min?

Asked by  | 17th Jun, 2008, 10:49: PM

Expert Answer:

This problem is related to the perimeter of the circle where radius is 1.5cm

2 pi r is the formula to find the perimeter of 1 whole circle but in 60 minutes a minute hand completes 1 whole circle.

we need perimeter of = 40/60 = 4/6 = 2/3 so we need 2/3 rd of the perimeter.

perimeter of the required part is = 2 x 3.14 x 1.5 x 2/3 = 6.28cm

Answered by  | 17th Jun, 2008, 11:04: PM

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