the diameter of a 120 cm long roller is 84 cm It takes 1000 complete revolutions in moving once over to level a playground what is the area of the playground
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Radius of the roller (r) = 84/2 cm = 42 cm Length of the roller (h) = 120 cm Curved surface area of the roller = 2rh = 2 x 22/ 7 x 42 x 120 cm2 = 44 x 720 cm2= 31680 cm2
. area covered by the roller in 1 revolution = 31680 cm2
. area covered by the roller in 1000 revolutions = 31680 x 1000 cm2 = 31680000 cm
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