A cylindrical roller has a radius of 20 cm and is 77 cm long. The area travelled by this roller is 500 revolution is

1331

m^{2}

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2000

m^{2}

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2660

m^{2}

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None of the above

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Solution

The correct option is A None of the above
Area levelled = n x CSA
= $500 \times \frac{22}{7} \times 20 \times 77 c m^{2}$
= $\frac{500 \times 2 \times 22 \times 20 \times 11}{10000} m^{2}$
= 484 $m^{2}$

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A cylindrical roller has a radius of 20 cm and is 77 cm long. The area travelled by this roller is 500 revolution is

The correct option is A None of the aboveArea levelled = n x CSA = 500×227×20×77cm2 = 500×2×22×20×1110000m2 = 484 m2

The correct option is A None of the above
Area levelled = n x CSA
= $500 \times \frac{22}{7} \times 20 \times 77 c m^{2}$
= $\frac{500 \times 2 \times 22 \times 20 \times 11}{10000} m^{2}$
= 484 $m^{2}$