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(3) The diameter of the roller is 84 cm and its length is120 cm. It takes 500 complete revolutions to moveonce over to level a playground. Find the area ofthe playground in square metres. [4 marks]Ans.

Answer»

Given,Diameter = d = 84cmRadius = r = d/2 = 42cmLength = l = 120 cmT.S.A of cylinder = 2πrh = 2 x 22/7 x 42 x 120 = 31680 cm²Area levelled by 500 revolution = Area of playground= 500 x 31680cm²= 15840000 cm² [ change into m]= 1584 m²

what is the area of play ground



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