Multiple choice

Calculate the surface area of a sphere with radius 3.2 cm.

  1. $110.6 \ cm^2$
  2. $128.6 \ cm^2$
  3. $131.5 \ cm^2$

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Surface area of a sphere = 4 * pi * r^2. With r = 3.2, Area = 4 * 3.14159 * (3.2)^2 = 4 * 3.14159 * 10.24 = 128.679. This matches option B.

AI explanation

Using the surface area of a sphere formula, 4 pi r squared, we substitute the radius of 3.2 cm. This gives 4 times 3.14159 times 10.24, which calculates to approximately 128.6 square cm.

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