Multiple choice

The surface area of a sphere of radius 3 cm is

  1. 24π cm2

  2. 36π cm2

  3. 18π cm2

  4. 9π cm2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The surface area of a sphere is 4 * pi * r^2. Given r = 3, surface area = 4 * pi * 3^2 = 4 * pi * 9 = 36 * pi cm^2.

AI explanation

Using the sphere surface area formula of 4 times pi times r squared, substitute the given radius of 3 cm. This gives 4 times pi times 3 squared, which equals 4 times pi times 9. Multiplying these values gives a total surface area of 36 pi square cm.

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