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Question

A roller of diameter 70cm and length 2m is rolling on the ground. What is the area covered by the roller in 50 revolutions ?

A
220m2
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B
230m2
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C
210m2
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D
330m2
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Solution

The correct option is A 220m2

Since the diameter of the roller is 70cm, its radius is 35cm.
In one revolution, the wheel covers the distance of one circumference.
Circumference of the roller of radius 35cm an length 700cm=2×227×35×200=44000cm2
Distance travelled in 50 revolutions =50×44000cm2=220000cm2=220m2


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