Answer
The rectangular equation is, $x=0$
Work Step by Step
Using, $\tan \theta =\frac{y}{x}$, we will convert the given polar equation to the rectangular equation.
Therefore,
$\begin{align}
& \tan \frac{\pi }{2}=\frac{y}{x} \\
& x=\frac{y}{\tan \frac{\pi }{2}} \\
& =\frac{y}{\infty } \\
& =0
\end{align}$
