Question 1052330: The large hand of a clock is 5cm long. How many centimetre does its extremity move in 20 minutes
Answer by rothauserc(4718)   (Show Source):
You can put this solution on YOUR website! There are 60 minutes in an hour, so 20 minutes is 20/60 = 1/3 of the circle
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circumference(C) of the circle is pi * D, where D is the diameter
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D = 2 * r, where r is the radius
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For our problem,
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D = 2 * 5 = 10 cm
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C = pi * 10 = 31.4286 cm
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The end of the large hand moves 31.4286 / 3 = 10.4762 cm
in 20 minutes
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