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What is the surface area of a sphere with a radius of nine units In pie
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What is the surface area of a sphere with a radius of nine units In pie

User Abrahim
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\textit{surface area of a sphere}\\\\ SA = 4\pi r^2~~ \begin{cases} r= radius\\[-0.5em] \hrulefill\\ r=9 \end{cases}\implies SA=4\pi (9)^2\implies SA=324\pi

User Amin Merati
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