Question

question 10 of 10
which expression gives the surface area of a sphere with radius r?

a. $4\pi r^2$

b. $4\pi r^3$

c. $\frac{4}{3}\pi r^2$

d. $\frac{4}{3}\pi r^3$

Explanation:

The surface area of a sphere is a standard geometric formula. Option B has an incorrect exponent for radius (volume uses cubed radius, area uses squared). Option C uses the wrong coefficient for surface area and is not the volume formula. Option D is the formula for the volume of a sphere, not surface area. Option A matches the standard surface area formula for a sphere.

Answer:

A. $4\pi r^2$