Question

Radius= 9 cmWhat is the surface area of the sphere?A 972π cm³C 324 cm³B 972π cm²D 324 cm²

Answer 1

To determine the surface area of a sphere we use the following formula:

`S=4\pi r^2,`

where r is the radius of the sphere.

We are given that the radius of the sphere is 9 cm, therefore:

`S=4\pi(9cm)^2.`

Simplifying the above result, we get:

`S=4\pi(81cm^2)=324\pi\text{ cm}^2.`

Answer:

`\begin{equation*} 324\pi\text{ cm}^2. \end{equation*}`