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The large hand of a clock Is 42 cm long. How many centi-metres does its extremity move in 20 minutes?

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Best answer

For 20 minutes = θ = 4 x 30° = 120° 

We know that l = r × θ 

l = 42 x 120 x π/180 = 28 x 22/7 = 88

Therefore, the length is equal to 88 cm.

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