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    • Question

      A cone has a radius of 18 cm and its curved surface area is

      1980 cm². Find its height.
      A 12 cm Correct Answer Incorrect Answer
      B 36 cm Correct Answer Incorrect Answer
      C 30 cm Correct Answer Incorrect Answer
      D 15 cm Correct Answer Incorrect Answer

      Solution

      Let slant height of the cone be ‘l’ cm

      So, (22/7) × 18 × l = 1980

      Or, l = 35 cm

      So, height of the cone (h) = √{35² – 18²} = 30 cm

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