Multiple choice

Find the surface area of a sphere of radius $10.5$ cm.

  1. $1386\ {cm}^{2}$
  2. $1836\ cm^2$
  3. $1368\ cm^2$
  4. $1683\ cm^2$
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A Correct answer
Explanation

Surface area of a sphere = 4 * pi * r^2. Using pi = 22/7, SA = 4 * (22/7) * (10.5)^2 = 4 * (22/7) * 110.25 = 88 * 15.75 = 1386.

AI explanation

Using the surface area of a sphere formula, 4 times pi times the square of the radius, we substitute the given values. This yields 4 multiplied by 22 over 7 and 10.5 squared, which simplifies to 88 over 7 times 110.25. The result is 1386 square centimeters.

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