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3 years ago

PLEASE HELP IM SO CONFUSED What is the surface area of a sphere with a radius of 9 units?

Mathematics

2 answers:

yaroslaw [1]3 years ago

6 0

4 x pi x 9^2
the answer is D

Andreas93 [3]3 years ago

6 0

Answer:

The answer is D. $324\pi(units)^{2}$

Step-by-step explanation:

Given a sphere of radius R, the surface area of the sphere can be calculated using the following equation :

$A=4\pi(R)^{2}$

The area depends of the variable R ⇒

$A(R)=4\pi(R)^{2}$

To find the surface area, we replace $R=9units$ in the equation ⇒

$A(9units)=4\pi(9units)^{2}=4\pi81(units)^{2}=324\pi(units)^{2}$

The correct answer is D. $324\pi(units)^{2}$

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