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The diameter of a roller is 84cm and it length is 120cm. It takes 500 complete revolutions moving once over to level a playground. What is the area of the



Diameter of the roller = 84 cm
so the radius is 42 cm

height of the roller = 120 cm

curved surface area = 2πrh
                                  = 2×22/7×42×120
                                  = 31680 cm²

it takes 500 complete revolution

so area of the playground = 31680 ×500
                                           =15840000 cm²

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