Multiple choice

Which of the following is the ratio of the surface area of the sphere with radius r to its volume?

  1. 4/r

  2. 3/r

  3. r/4

  4. r/π

  5. 4/π

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Surface area of sphere = 4*pi*r^2. Volume of sphere = (4/3)*pi*r^3. Ratio = (4*pi*r^2) / ((4/3)*pi*r^3) = 1 / (r/3) = 3/r.

AI explanation

The surface area of a sphere is 4 r^2 and the volume is (4/3) r^3. Their ratio is (4 r^2) / ((4/3) r^3), which simplifies to 3/r.