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Question

# The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m2? [Assume π=227]

A

2584 m2

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B

1584 m2

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C

1534 m2

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D

1984 m2

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Solution

## The correct option is B 1584 m2 A roller is cylindrical shaped. Height (h) of cylindrical roller = Length of roller = 120 cm Radius (r) of the circular end of roller =(842)cm=42 cm CSA of roller =2πrh =31680 cm2 Area of field =500×CSA of roller =(500×31680)cm2=15840000 cm2=1584 m2

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