the large hand of a clock is 28 cm long. how many centimeters does its extremely move in 20 minutes.

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20 mins is 1/3 of the circumference. The radius of the circle is 28cm so the circumference is 28π. One third is 28π/3=29.32cm. The extreme point of the minute hand moves about 29.32cm. The angular distance is 360/3=120 degrees.

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