Question
A giant circular wheel has a diameter of 28 metres. In
how many revolutions will the wheel cover a total of 11 km?Solution
Radius of the giant wheel = 28 á 2 = 14 metres Circumference of the giant wheel = 2 Ă Ď Ă radius = 2 Ă (22/7) Ă 14 = 88 metres So, number of rotations to cover 11 km i.e. 11000 metres = 11000 á 88 = 125
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