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Bom dia Rubens!
Solução!
![A= \pi r^{2}\\\\\\
64 \pi = \pi r^{2} \\\\\\
64=r^{2}\\\\\
\sqrt{64}=r\\\\\\
8=r\\\\\\\\
Resposta: r=8cm](https://tex.z-dn.net/?f=A%3D+%5Cpi+r%5E%7B2%7D%5C%5C%5C%5C%5C%5C%0A64+%5Cpi+%3D+%5Cpi+r%5E%7B2%7D+%5C%5C%5C%5C%5C%5C%0A64%3Dr%5E%7B2%7D%5C%5C%5C%5C%5C%0A+%5Csqrt%7B64%7D%3Dr%5C%5C%5C%5C%5C%5C%0A8%3Dr%5C%5C%5C%5C%5C%5C%5C%5C%0AResposta%3A+r%3D8cm+++ "A= \pi r^{2}\\\\\\
64 \pi = \pi r^{2} \\\\\\
64=r^{2}\\\\\
\sqrt{64}=r\\\\\\
8=r\\\\\\\\
Resposta: r=8cm")
Bom dia!
Bons estudos!
Solução!
Bom dia!
Bons estudos!
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