Multiple choice

If the radius of a hemisphere is 3 cm, then its total surface area is

  1. 27π cm2

  2. 9π cm2

  3. 18π cm2

  4. 36π cm2
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A Correct answer
Explanation

Total surface area of a hemisphere = 3 * pi * r^2. With r = 3, TSA = 3 * pi * 9 = 27 * pi.

AI explanation

The total surface area of a hemisphere consists of its curved surface area plus its flat circular base, giving the formula 3*pi*r^2. Substituting the given radius of 3 cm into the formula results in 3*pi*(3)^2. This calculates to 27*pi cm2.

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