Solve for S
S=\frac{V_{a}a}{2}
Solve for V_a
\left\{\begin{matrix}V_{a}=\frac{2S}{a}\text{, }&a\neq 0\\V_{a}\in \mathrm{R}\text{, }&S=0\text{ and }a=0\end{matrix}\right.
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Examples
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