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    Question

    Calculate the lateral surface

    area of a right circular cone having a radius of 5 cm and a height of 12 cm.
    A 45╧А cm┬▓ Correct Answer Incorrect Answer
    B 65╧А cm┬▓ Correct Answer Incorrect Answer
    C 24╧А cm┬▓ Correct Answer Incorrect Answer
    D 72╧А cm┬▓ Correct Answer Incorrect Answer

    Solution

    Given, Radius of the cone = 5 cm Height of the cone = 12 cm So, slant height of the cone = тИЪ(12┬▓ + 5┬▓) = тИЪ(144 + 25) = тИЪ169 = 13 cm Thus, the lateral surface area of the cone = ╧А ├Ч radius ├Ч slant height = ╧А ├Ч 5 ├Ч 13 = 65╧А cm┬▓

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