Question

Q4. The diameter of roller is 168 cm d
its length is 60 cm. it takes 25
complete revolution to move once to
level a round. Find the area of the
ground.
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Answer 1

Answer:

I had solved similar example, you try yourself and do best,

Step-by-step explanation:

a diameter of a ground roller is 168 cm and it's length is 240 cm .it take 1000 complete revolutions moving once over to level the ground. find the area of the ground.

Answer 2

Answer:

Step-by-step explanation:

roller is of cylinder form.

radius = diameter/2 = 168/2 = 84 cm.

area of roller = curved surface area of cylinder

= 2 pi r h

= 2 x 22/7 x 84 x 60

= 31680 cm^2

area of 1 revolution = area of roller =  31680 cm^2.

area of 25 revolutions = 25 x 31860 cm^2

area of playground =  792000 cm^2

                                 = 792000 x 1/100 x 1/100 = 79.2 m^2

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