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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?

300
400
600
4000

Correct Answer: 400

Explanation:

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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