Question

What is the surface area of a sphere with radius 'r' ?

• A. $2\pi r^2$
• B. $\pi r^2$
• C. $3\pi r^2$
• D. $4\pi r^2$

Answer 1

The correct option is D $4\pi r^2$

Consider the following sphere with centre $O$ and radius $OA=r$,


The formula used to find the surface area of sphere with radius $r$ is given as,

$\text{Surface area of sphere}=4\pi r^2$