A circular disc of area 0.49 π square meters, rolls down a length of 1.76 km. The number of revolutions it makes is?

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Accepted Answer

Area = πr2 = 0.49π ⇒ r = 0.7 m Number of revolutions = total distance / circumference = (1.76 x 1000) / (2 x 22/7 x 0.7) = 400

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