Mathematics
Grade9
Easy

Question

Find the surface area of the sphere with radius of 19.5cm

  1. 9160.88cm2
  2. 2290.22cm2
  3. 4778.36cm2
  4. 82447.96cm2

hintHint:

The Surface area of the sphere is given by  4 cross times straight pi cross times left parenthesis radius right parenthesis squared

The correct answer is: 4778.36cm2


    text  Surface Area  end text equals 4 pi r squared
equals 4 cross times pi cross times 19.5 squared
equals 1521 pi
equals space 4778.36 space c e n t i m e t e r s squared

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