There is a point $P(3, 0)$ inside the circle $x^2 + y^2 = r^2$, a chord $AB$ of the circle passes through point $P$ such that $AP = 2$ and $BP = 8$, then the radius of the circle is
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There is a point $P(3, 0)$ inside the circle $x^2 + y^2 = r^2$, a chord $AB$ of the circle passes through point $P$ such that $AP = 2$ and $BP = 8$, then the radius of the circle is