Question
A giant circular wheel has a diameter of 14 metres. In
how many revolutions will the wheel cover a total of 4.4 km?Solution
Radius of the giant wheel = 14 ÷ 2 = 7 metres Circumference of the giant wheel = 2 × π × radius = 2 × (22/7) × 7 = 44 metres So, number of rotations to cover 4.4 km i.e. 4400 metres = 4400 ÷ 44 = 100
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