Question

The radius of the wheel of a car is 2.1 m. How many revolution des the
wheel make while travelling 6.6 km?​

Answer 1

Given:

• The radius of the wheel of a car is 2.1 m.

• Distance = 6.6 km

To find out:

How many revolution will it make in travelling 6.6 km?

Solution:

Radius = 2.1 m

Circumference of circle = 2πr

= 2 × 22/7 × 2.1

= 44/7 × 21/10

= 44 × 3/10

= 132/10

= 13.2 m

Now,

✪Distance covered = 6.6 km = 6.6 × 1000 = 6600

Therefore,

Number of revolutions = Distance/Radius

= 6600/13.2

= 6600 × 10 / 132

= 66000/132

= 500

Hence, 500 revolution will it make in travelling 6.6 km.

Answer 2

Step-by-step explanation:

Given -

• Radius of the wheel of a car is 2.1 m

To Find -

• Number of revolution make by wheel while travelling 6.6 Km

As we know that :-

• Circumference of circle = 2πr

Now,

» 2 × 22/7 × 2.1

» 2 × 22 × 0.3

» 22 × 0.6

• » 13.2 m

Now,

As we know that :-

• 1 Km = 1000 m

» 6.6 × 1000

• » 6600 m

Now,

• Number of revolution = Distance/radius

» 6600/13.2

» 6600 × 10/132

» 50 × 10

• » 500

Hence,

The number of revolution make by wheel while travelling 6.6 Km is 500 revolutions.