Mathematics
Grade9
Easy

Question

How do you find the total surface area of a cone?

  1. pi r l
  2. pi r l plus pi r squared
  3. 1 half P l
  4. 1 half P l plus B

hintHint:

The Total surface area of cone = base area + lateral surface area.

The correct answer is: pi r l plus pi r squared


    The Total surface area of cone = base area + lateral surface area.
    The base area of cone =  πr2  and lateral surface area of cone is  is πrl .
    where l is the slant height and r is the radius of the circular base of the cone.
    The Total surface area of cone = πrl + πr2.
    Therefore, The formula for the total surface area of a cone is πrl + πr2.

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