To do this, we can set the two equations equal to each other:
$r-2 = \sqrt{r}$
Now, we can solve for $r$:
$r-2 - \sqrt{r} = 0$
Let's make a substitution to make it easier to solve. Let $x = \sqrt{r}$, so $x^2 = r$. Our equation becomes:
$x^2 - 2 - x =
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