Question

A wheel has diameter 84cm . Find how many complete revolution must it take to cover 792m.​

Answer 1

Diameter = 84

radius = 42cm

to find the revolutions we need to find the circumference of the circle

c = 2πr

c = 2 × $\frac{22}{7}$ × 42

c = $\frac{44}{7}$ × 42

c = 44×6

c = 264

now convert 792 into cm and divide the distance by the circumference

$\frac{79200}{264}$

= 300

the wheel will cover 300 full revolutions

Answer 2

Step-by-step explanation:

given diameter= 84 cm

therefore radius= 84/2 =42 cm

now for a revolution, the circumference of circle will roll on land...

therefore for

1 revolution the distance covered

= 2πr

= 2*22/7* 42

=264 cm

now the total distance to be covered in terms of cm = 792*100

= 79200 cm

number of revolution =79200/ 264= 1200 revolutions

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