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    Question

    The inner radius of a hollow cylindrical pipe is 4.8 cm. If

    the length of the pipe and the thickness of the pipe are 20 cm and 2.5 cm, respectively, calculate the volume of the pipe. (Use π = 22/7)
    A 1290 cm³ Correct Answer Incorrect Answer
    B 1850 cm³ Correct Answer Incorrect Answer
    C 1370 cm³ Correct Answer Incorrect Answer
    D 1650 cm³ Correct Answer Incorrect Answer

    Solution

    ATQ,

    Outer radius of the pipe = 4.8 + 2.5 = 7.3 cm

    Volume of the hollow pipe = π × height × [(outer radius)² - (inner radius)²]

    = (22/7) × 20 × (7.3² - 4.8²)

    = (22/7) × 20 × (53.29 - 23.04)

    = (22/7) × 20 × 30.25

    = 1,290 cm³

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