The diameter of a 120cm long rollar is 84cm. IT takes 1000 complete revolutions moving once over to level a playground. What is the area of the playground ?
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Step-by-step explanation:
Radius of the roller (r) = 84/ 2 cm = 42 cm
Length of the roller (h) = 120 cm
Curved surface area of the roller = 2πrh
= 2 × 22/ 7 × 42 × 120 cm2 = 44 × 720 cm2= 31680 cm2
∴ area covered by the roller in 1 revolution = 31680 cm2
∴ area covered by the roller in 1000 revolutions = 31680 × 1000 cm2 = 31680000 cm
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