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The diameter of a roller is …

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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.

    • Posted by Neshok Ls 5 years ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Gaurav Seth 5 years ago

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

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