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    Question

    A cylindrical road roller has a diameter of 4 m and a

    length of 2 m. It rotates 8 times every minute. Find the area it rolls over in 25 minutes.
    A 5,028.57 m² Correct Answer Incorrect Answer
    B 2,057.19 m² Correct Answer Incorrect Answer
    C 3,350.14 m² Correct Answer Incorrect Answer
    D 1,227.12 m² Correct Answer Incorrect Answer

    Solution

    ATQ,

    CSA = 2 × π × radius × height

    = 2 × (22/7) × (4/2) × 2

    = 2 × (22/7) × 2 × 2 = (176/7) m²

    Area in 1 minute = 8 × (176/7) = 1,408/7 m²

    Area in 25 minutes = 25 × (1,408/7) = 35,200/7 = 5,028.57 m²

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