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    Question

    Find the volume of a frustum of a cone with a height of

    9 cm, the radius of the upper base as 4 cm, and the radius of the lower base as 6 cm. (Use π = 3.14)
    A 715.9 cm³ Correct Answer Incorrect Answer
    B 756.8 cm³ Correct Answer Incorrect Answer
    C 945.6 cm³ Correct Answer Incorrect Answer
    D 645.6 cm³ Correct Answer Incorrect Answer

    Solution

    Volume of frustum = (1/3)πh(r1² + r2² + r1r2) = (1/3) × 3.14 × 9 × (4² + 6² + 4 × 6) = (1/3) × 3.14 × 9 × (16 + 36 + 24) = (1/3) × 3.14 × 9 × 76 = 715.9 cm³.

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