Question
A giant circular wheel has a diameter of 63 metres. In
how many revolutions will the wheel cover a total of 79.2 km?Solution
Radius of the giant wheel = 63 ÷ 2 = 31.5 metres Circumference of the giant wheel = 2 × π × radius = 2 × (22/7) × 31.5 = 198 metres So, number of rotations to cover 79.2 km i.e. 79200 metres = 79200 ÷ 198 = 400
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