Question

the diameter of the wheel of a car is 77 cm how many revolutions will it make to travel 121 kilometre

Answer 1

diameter is 77 therefore radius is 77/2= 38.5

circumference of circle= 2πr or πd



= 3.14*77= 241.78 cm


now convert 121 km in cm
i.e:- 12100000cm

now 12100000/241.78= 50045.4959

50045.5 revolutions it will takes to travel 121 km

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