Multiple choice

What is the ratio of the surface area of a sphere with radius 1 cm to the surface area of a sphere with radius 2 cm?

  1. 3 : 2

  2. 1 : 5

  3. 1 : 4

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Surface area of a sphere is 4 * pi * r^2. Ratio = (4 * pi * 1^2) / (4 * pi * 2^2) = 1 / 4.

AI explanation

Using the surface area of a sphere formula, the area is four multiplied by pi and the radius squared. The ratio of the surface areas is the ratio of their radii squared, giving one squared to two squared, which simplifies to the ratio 1 : 4.

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