Mathematics
Grade9
Easy

Question

Find the lateral area.

  1. 3830.23 space cm squared
  2. 1321.6 space cm squared
  3. 3482.4 space cm squared
  4. 1009.82 space cm squared

hintHint:

The Formula lateral surface area of the cone is left parenthesis pi r right parenthesis l  where l is the slant height and r is the radius of the circular base of the cone.

The correct answer is: 1009.82 space cm squared


    Given slant height of cone = 26.8 cm (from diagram)
    The diameter of circular base = 24 cm
    The radius of circular cone = 24/ 2 = 12 cm (as radius equals to diameter divided by 2)
    text  Use the lateral area formula,  end text
text  Lateral area  end text equals pi rl
equals 3.14 cross times 12 cross times 26.8
equals 1009.82 space cm squared
    Therefore, Lateral surface area of the cone is  1009.82 square centimeters.

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