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Radius of circle with circumference 19pi

User NCA
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\textit{Circumference of a Circle}\\\\ C=2\pi r ~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ C=19\pi \end{cases}\implies 19\pi =2\pi r\implies \cfrac{19\pi }{2\pi }=r\implies \boxed{9.5=r}

User Pablo Pardo
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