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![\bf \textit{surface area of a sphere}\\\\ SA=4\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r= 4 \end{cases}\implies SA=4\pi (4)^2 \\\\\\ SA=64\pi \implies SA\approx 201.06](/tpl/images/0522/4262/8ac7a.png)
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