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What is the radius of a sphere if its surface area is 2,122.64 square inches? (Use 3.14 for .) 11 in. 13 in. 121 in. 169 in.
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What is the radius of a sphere if its surface area is 2,122.64 square inches? (Use 3.14 for .)

11 in.
13 in.
121 in.
169 in.

User Yogesh Sharma
by
5.7k points

2 Answers

1 vote

\bf \textit{surface area of a sphere}\\\\ SA=4\pi r^2~~ \begin{cases} r=radius\\ ------\\ SA=2122.64 \end{cases}\implies 2122.64=4\pi r^2 \\\\\\ \cfrac{2122.64}{4\pi }=r^2\implies \cfrac{530.66}{\pi }=r^2\implies \sqrt{\cfrac{530.66}{\pi }}=r
User Gianmarco Carrieri
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6.2k points
2 votes

Answer:

13

Explanation:

User Hsuan Lee
by
5.6k points
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