Transcendence of the rational powers of $\pi$?

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What is known about transcendence of the numbers of the form ${\pi}^{r}$ where $r \in \mathbb Q \setminus \{0,1\}$? For which $r$ are they proven to be transcendental?

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All of them.

If $\theta=\pi^{a/b}$ is algebraic then so is $\theta^b = \pi^a$ and so is $\pi$.