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    Question

    A frustum of a cone has radii of 5 cm and 3 cm, and a

    height of 8 cm. What is its volume?
    A 390 cm³ Correct Answer Incorrect Answer
    B 411 cm³ Correct Answer Incorrect Answer
    C 422 cm³ Correct Answer Incorrect Answer
    D 468 cm³ Correct Answer Incorrect Answer

    Solution

    Volume of a frustum of a cone = (1/3)πh(R² + Rr + r²) = (1/3)π * 8 * (5² + 5*3 + 3²) = 410.66                     ≈ 411 cm³. Answer: (B)

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