7. The radius of the wheel of a car is 21 em Find the number of revolutions made by it to cover a distance of 66 km . 22/7
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1
Answer:
Radius (r) of circular wheel is 21 cm. Total distance covered by the wheel is 924 meters (m). ∴ A wheel takes 700 revolutions in travelling a distance of 924 meters
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Step-by-step explanation:
radius = 21 cm
circumference of circle =2πr=2*(22/7)*21=132 cm
66km =6600000cms
total revolutions=6600000/132
=50000 revolutions
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