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      Question

      A right circular cone has a base radius of 9 cm and a

      height of 12 cm. Calculate the curved surface area of this cone.
      A 124π sq cm Correct Answer Incorrect Answer
      B 180π sq cm Correct Answer Incorrect Answer
      C 135π sq cm Correct Answer Incorrect Answer
      D 155π sq cm Correct Answer Incorrect Answer

      Solution

      Slant height of the cone = √{(radius)2 + (height)2} = √(92 + 122) = √(81 + 144) = √225 = 15 cm So, curved surface area of the cone = π X radius X slant height = 135π cm2

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