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g100num [7]
3 years ago
7

Radius of a sphere that has a surface area 12.56in2 use 3.14

Mathematics
1 answer:
enot [183]3 years ago
8 0
\bf \textit{surface area of a sphere}\\\\
A=4\pi r^2\qquad 
\begin{cases}
r=radius\\
-----\\
A=12.56
\end{cases}\implies 12.56=4\pi r^2
\\\\\\
\cfrac{12.56}{4\pi }=r^2\implies \sqrt{\cfrac{12.56}{4\pi }}=r
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