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Q.

A road roller takes 750 complete revolutions to move once over to level a road. Find the area of road if the diameter of a road roller is 84 cm and length is 1m.


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a

Question Image

b

Question Image

c

Question Image

d

Question Image 

answer is D.

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Detailed Solution

Concep- The road roller will cover an area equal to its lateral surface area in one revolution. Begin by calculating the radius of the roller. Second, use the formula to work out on the road area.
Here, Question ImageQuestion ImageNow, Area of road covered in 1 revolution Question Image Therefore, Area of road covered in 750 revolutions Question ImageHence, the correct answer is option 4.
 
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