Ebaluatu (complex solution)
r=\frac{3V}{2\pi }\text{ and }\frac{3V}{2\pi }=\frac{3V}{2\pi r^{2}}
Ebatzi: r
\left\{\begin{matrix}r=-1\text{, }&V=-\frac{2\pi }{3}\text{ and }h\neq 0\\r=1\text{, }&V=\frac{2\pi }{3}\text{ and }h\neq 0\end{matrix}\right.
Ebatzi: V
V=\frac{2\pi r}{3}
|r|=1\text{ and }h\neq 0
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