Answer
a) $V$ = $\pi{r}^{2}c$
b) $V$ = $\pi{r}^{2}c$
Work Step by Step
a)
$V$ = $\pi{r}^{2}c$
b)
$V$ = $2\pi\int_0^{r}cxdx$
$V$ = $2\pi(\frac{1}{2}cx^{2})|_0^r$
$V$ = $\pi{r}^{2}c$
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