What is the graph of the polar equation theta = pi?

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The question exactly goes like the title. I'm thinking that it's a point on the 3.14, but as I'm typing this I realize that I'm wrong and now I'm out of clues (Google didn't help). Please enlighten me.

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$\theta=k$ would be a line passing through the origin, with slope $\tan(k)$.

So here, the slope would be $\tan(\pi)$, but only in the backward direction, that is the the negative $x$ axis in this case.

Here is a picture, showing two graphs. $\color{red}{Red}$ for $2\pi/3$ and $\color{blue}{blue}$ for $\theta=\pi$

enter image description here