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ivolga24 [154]
3 years ago
5

The volume of a fear is 4,000pi m³. What is the surface area of the sphere to the nearest square meter?

Mathematics
1 answer:
gladu [14]3 years ago
7 0
\bf \textit{volume of a sphere}\\\\
V=\cfrac{4\pi r^3}{3}\qquad 
\begin{cases}
r=radius\\
-----\\
V=4000\pi 
\end{cases}\implies 4000\pi =\cfrac{4\pi r^3}{3}
\\\\\\
\cfrac{3}{4\pi }\cdot 4000\pi =r^3\implies \boxed{\sqrt[3]{\cfrac{3000}{\pi }}=r}\\\\
-----------------------------\\\\
\textit{surface area of a sphere}\\\\
S=4\pi r^2\qquad \qquad S=4\pi \left( \boxed{\sqrt[3]{\cfrac{3000}{\pi }}} \right)^2\implies S=4\pi \sqrt[3]{\cfrac{9000}{\pi^2}}
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