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    Question

    A right circular cone has a height of 24 cm and a base

    radius of 9 cm. What is the total surface area of the cone, including the base?
    A 594 cm┬▓ Correct Answer Incorrect Answer
    B 612 cm┬▓ Correct Answer Incorrect Answer
    C 978 cm┬▓ Correct Answer Incorrect Answer
    D 625 cm┬▓ Correct Answer Incorrect Answer

    Solution

    Slant height (l) of the cone = тИЪ(r┬▓ + h┬▓) = тИЪ(9┬▓ + 24┬▓)┬а = тИЪ(81 + 576) = тИЪ657 тЙИ 25.61 cm. Total surface area = ╧Аr(l + r), Total surface area = ╧А ├Ч 9 ├Ч (25.61 + 9) = ╧А ├Ч 9 ├Ч 34.61 = 311.49╧А тЙИ 978 cm┬▓.

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