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 Γ· 2 = 31.5 metres Circumference of the giant wheel = 2 Γ Ο Γ radius = 2 Γ (22/7) Γ 31.5 = 198 metres So, number of rotations to cover 79.2 km i.e. 79200 metres = 79200Β Γ· 198 = 400


