Question

5. The diameter of a car wheel is 42 cm. Find the distance travelled by the car in 100
revolutions.
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Answer 1

Answer:

In one revolution, the wheel covers the distance of one circumference.

Circumference of the circle  =2πr=2×722×42=264cm=2.64m

Distance travelled in 200 revolutions =200×2.64=528m

Answer 2

Circumference of a wheel = distance cover in 1 revolution

Circumference of a wheel = 2*pi*r
= 2*22/7*21
= 2*22*3
= 2*66
= 132 cm
Distance cover in 1 rotation=132 cm
Distance cover in 100 rotations=132*100
=13200cm

Car wheel cover a distance of 13200 cm in 100 rotations.