Question

the diameter of a circle wheel is 14 cm. how many revolution will it make in 5.5 km.

Answer 1

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Answer 2

Diameter of the circular wheel = 14 cm

We know that the circumference of a circle is equal to the product of pi and diameter/two times the radius therefore,

Circumference of the wheel = π * D, where D stands for diameter of the circle

C = $\bold{\frac{22}{7} \times 14 }$

C = $\bold{22 \times 2}$

C = $\bold{44 cm}$

Circumference of wheel = Distance travelled by it in 1 revolution

Distance travelled by wheel in 1 revolution = 44 cm

Let the number of revolutions be ' x '.

Distance to be travelled = 5.5 km = 5500 m = 550000 cm

Therefore,

44 * x = 550000

x = 550000 / 44

x = 50000 / 4

x = 25000 / 2

x = 12500

Hence,

The required number of revolutions = 12500