Answer
$\frac{dC}{dr}=2\pi$
Work Step by Step
$C=2\pi{r}$
$\frac{dC}{dr}=2\pi\times1r^{1-1}$
$\frac{dC}{dr}=2\pi\times1r^{0}$
$\frac{dC}{dr}=2\pi\times1$
$\frac{dC}{dr}=2\pi$
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