The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m².
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Radius of Roller = Diameter/2 = 84/2 = 42cm
Area of Roller = curved surface of cylinder = 2πrh
= (2×22/7×42×120)cm²
Area of 1 revolution = Area of Roller =31680 cm²
Area of 500 revolution = 500×15840000 cm²
= 15840000×1/100×1/100m² = 1584 m²
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