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\begin{tikzpicture}[scale=.5]
\tkzDefPoint(0,0){A}
\tkzDefPoint(3,-4){B}
\tkzDefCircle[through](A,B)
\tkzGetLength{rABpt}
\tkzpttocm(\rABpt){rABcm}
\tkzDrawCircle(A,B)
\tkzDrawPoints(A,B)
\tkzLabelPoints(A,B)
\tkzDrawSegment[dashed](A,B)
\tkzLabelSegment(A,B){%
$\pgfmathprintnumber{\rABcm}$}
\end{tikzpicture}
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