Question

The radius of the wheel of a car is 21 cm how many times will it revolve to travel a distance of 66 kilometre

Answer 1

Answer:

50000

Explanation:

Distance covered in 1 revolution = 2 π r

Distance covered in n revolutions = 66km

= 6600000 cm

2×π×21× n= 6600000

n= 6600000×7

2×22×21

n = 50000

The wheel revolves 50000 times to cover a distance of 66km.

Answer 2

Given

The radius of the car's wheel is 21 cm.

To Find,

The number of times the wheel must turn in order to go 66 kilometres.

Solution

We know in 1 revolution wheel cover  2 π r distance and the total distance covered by wheel is 66km = 6600000 cm.

then,

2×π×21× n= 6600000, where n is the number of times the wheel revolves.

n= (6600000×7)/2*21*22

n = 50000

As a result, the wheel must spin 50000 times to reach a distance of 66 kilometres.