Question

The diameter of the wheelofa caris84cm.How far will it be 1,500 revolutions? Give your answer.

Answer 1

Hi friend
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Your answer
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Diameter of the wheel of a car = 84 cm

Radius = 84/2 cm = 42 cm

Therefore,

circumference of the wheel = 2 × π × r

(2 × 22/7 × 42) cm = 264 cm

So,
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Distance coveted in one revolution = 264 cm

Distance covered in 1500 revolutions = (264 × 1500) cm = 396000 cm = 3.96 km

HOPE IT HELPS

Answer 2

Hi there !!

Diameter of a car = 84cm

Radius = diameter/2 = 84/2 = 42cm

Distance travelled in 1 revolution = circumference of the wheel

Circumference = 2πr

$= 2 \times \frac{22}{7} \times 42cm$
= 264cm

Distance in one revolution = 264cm

Distance in 1500 revolutions = 1500 × 264
= 396000 cm

So,

the distance in 1500 revolutions is 396000cm or 3.96km

NOTE :
one can also find the circumference directly by using another formula ie, πd , where d is the diameter which is 84cm instead of using 2πr

No matter , what the formula you use , whether its 2πr or πd , the answer will be the same.