Answer:
The answer is D.[tex]324\pi(units)^{2}[/tex]
Step-by-step explanation:
Given a sphere of radius R, the surface area of the sphere can be calculated using the following equation :
[tex]A=4\pi(R)^{2}[/tex]
The area depends of the variable R ⇒
[tex]A(R)=4\pi(R)^{2}[/tex]
To find the surface area, we replace [tex]R=9units[/tex] in the equation ⇒
[tex]A(9units)=4\pi(9units)^{2}=4\pi81(units)^{2}=324\pi(units)^{2}[/tex]
The correct answer is D.[tex]324\pi(units)^{2}[/tex]
