Multiple choice

What is its total surface area of a hemisphere if the radius of a hemisphere is $7\ cm$?

  1. $264\ cm^{2}$
  2. $206\ cm^{2}$
  3. $462\ cm^{2}$
  4. $642\ cm^{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total surface area of a hemisphere = 3 * pi * r^2. TSA = 3 * (22/7) * 7 * 7 = 3 * 22 * 7 = 462 cm^2.

AI explanation

The total surface area of a hemisphere equals 3 pi r squared, combining the curved surface and the flat circular base. Substituting the radius of 7 cm gives 3 times (22/7) times 7 squared. This results in a total surface area of 462 square cm.

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