The diameter of roller 1.5 m long is 84cm

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The diameter of roller 1.5m long is 84cm. If it takes 100 revolutions to level a playground ,find the cost of leveling this ground at the rate of 50 paise per square metre.

Answered by admin @


Given that, 

Diameter of the roller = 84 cm = 0.84 m

Length of the roller = 1.5 m

Radius of the roller = D/2 = 0.84/2 = 0.42

Area covered by the roller on one revolution = covered surface area of roller

Curved surface of roller = 2πrh = 2 x 22/7 x 0.42 x 1.5

= 0.12 x 22 x 1.5 m2

 Area of the playground = 100 x Area covered by roller in one revolution

= (100 x 0.12 x 22 x 1.5) m2

= 396 m2


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