Question

The diameter of a wheel is 42cm. How many revolutions will it make to travel 396m.​

Answer 1

Answer:

Diameter of wheel=84cm

Radius of wheel=84/2=42cm

Circumference of the wheel = 2r

=84 cm2

Let x be the no.of revolutions

792m=79200cm

x*84=79200

x=79200/84

x=79200/84*7/22

x=300

Therefore no.of revolutions=300

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Answer 2

Answer:

d=42 cm

r=21 cm

no. of revolutions =circumference of circle=2πr

therefore, revolution= 2*22/7*21

revolution=132

Now,no. of revolutions to travel 396m= 39600/132

= 300

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