Question

the diameter of the wheel of a car is 77 cm. how many revolution will it make to travel 12 km. (in 150 words ).

Answer 1

Given diameter is 77cm

First of all we need to find circumference.

We know that circumference = 2πr

Or we can write circumference = πd

Hence, give circumference =
$\frac{22}{7} \times 77 \\ = > 22 \times 11 \\ = > 242$
242 cm


Now given distance is 12 km

We need to convert km to cm

1 km = 1000 m
1m = 100 cm

So 1km = 1000 × 100cm
1 km = 1,00,000 cm
=> 12km = 12,00,000cm

So revolution required to cover a distance of 12,00,000cm = distance given ÷ circumference

= 12,00,000/242
= 4958.67 revolution approx


So it would nearly requires 4959 revolution


Hope it helps dear friend ☺️✌️✌️

Answer 2

Answer :

The diameter of the wheel of the car is

d = 77 cm

Then, its circumference be

S = πd cm

= (π × 77) cm

= (22/7 × 77) cm

= (22 × 11) cm

= 242 cm

We know that, 1 km = 100000 cm

Then, L = 12 km = 1200000 cm

To travel 12 km, the wheel will revolve

= L/S times

= 1200000/242 times

= 4959 times (approximately)

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