Circumference of tyre = 2 πr = Distance travelled in each rotation = 2 ×22/7× 7 = 44 cm. Total distance covered = Number of rotations × Circumference of tyre N ...

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Standard IX

Mathematics

Circumference of a Circle

. Use .π=22/7

Question

A car has to travel 0.121 km to reach from A to B. If the radius of the tyre is 7 cm. How many times will the tire rotate while the car travels from A to B ? (Use π = $\frac{22}{7}$ )

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Solution

Circumference of tyre = 2 πr = Distance travelled in each rotation = $2 \times \frac{22}{7} \times 7$ = 44 cm.

Total distance covered = Number of rotations $\times$ Circumference of tyre

Number of rotations = $\frac{0.121 k m}{44 c m} = \frac{0.121 \times 1000 m}{44 \times 0.01 m}$ = 275

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A car has to travel 0.121 km to reach from A to B. If the radius of the tyre is 7 cm. How many times will the tire rotate while the car travels from A to B ? (Use π = 227) ___

Circumference of tyre = 2 πr = Distance travelled in each rotation = 2×227×7 = 44 cm. Total distance covered = Number of rotations × Circumference of tyre Number of rotations = 0.121 km44 cm=0.121×1000 m44×0.01 m = 275

A car has to travel 0.121 km to reach from A to B. If the radius of the tyre is 7 cm. How many times will the tire rotate while the car travels from A to B ? (Use π = $\frac{22}{7}$ )

___

Circumference of tyre = 2 πr = Distance travelled in each rotation = $2 \times \frac{22}{7} \times 7$ = 44 cm.

Total distance covered = Number of rotations $\times$ Circumference of tyre

Number of rotations = $\frac{0.121 k m}{44 c m} = \frac{0.121 \times 1000 m}{44 \times 0.01 m}$ = 275