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Sagot :
[tex]V=\frac{4 \pi r^3}{3}\\
\\
4500\pi=\frac{4 \pi r^3}{3}\\
\\
13500 \pi=4 \pi r^3\\
\\
r^3=\frac{13500 \pi}{4 \pi}\\
\\
r^3=3375 \\
\\
\boxed{r=15 in}[/tex]
[tex]S=4 \pi r^2\\ \\ S=4 \pi 15^2\\ \\ \boxed{S=900 \pi \ in^2}[/tex]
[tex]S=4 \pi r^2\\ \\ S=4 \pi 15^2\\ \\ \boxed{S=900 \pi \ in^2}[/tex]
[tex]Cube : \ V=4500 \ \pi \ in^3\\\\V=\frac{4}{3}\pi r^3 \\ \\4500 \pi =\frac{4}{3}\pi r^3 \ \ / \cdot (\frac{3}{4\pi})\\ \\\frac{3}{4\pi}\cdot 4500 \pi =\frac{3}{4\pi}\cdot \frac{4}{3} \pi r^3\\ \\r^3 =3*1125[/tex]
[tex]r^3 = 3375 \\\\r=\sqrt[3]{3375}\\ \\r=15 \ in \\ \\ the \ surface \ area : \\\\SA = 4 \pi r^2 \\ \\SA=4 \pi \cdot 15^2 = 4\cdot 225 \pi = 900 \pi \ in^2[/tex]
[tex]r^3 = 3375 \\\\r=\sqrt[3]{3375}\\ \\r=15 \ in \\ \\ the \ surface \ area : \\\\SA = 4 \pi r^2 \\ \\SA=4 \pi \cdot 15^2 = 4\cdot 225 \pi = 900 \pi \ in^2[/tex]
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