Multiple choice

Find the surface area of a sphere of radius $5.6$ cm.

  1. $394.24{cm}^{2}$
  2. $394.42\ cm^2$
  3. $493.24\ cm^2$
  4. $493.42\ cm^2$
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A Correct answer
Explanation

Surface area of a sphere = 4 * pi * r^2. Using pi = 3.14, 4 * 3.14 * (5.6)^2 = 12.56 * 31.36 = 393.88. Using pi = 22/7, 4 * (22/7) * 5.6 * 5.6 = 88 * 0.8 * 5.6 = 394.24.

AI explanation

Using the sphere surface area formula, 4 times pi times r squared, with a given radius of 5.6 cm gives 4 times 22 divided by 7 times 5.6 squared. The square of 5.6 is 31.36, and multiplying this by 22 divided by 7 and then by 4 results in 394.24 cm squared.

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