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\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 140 (Section 18.1.1 : Example with a random point and  option \tkzname{through})

\begin{tikzpicture}[scale=1]
 \tkzDefPoint(0,4){A}
 \tkzDefPoint(2,2){B}
 \tkzDefMidPoint(A,B) \tkzGetPoint{I}
 \tkzDefRandPointOn[segment = I--B]
  \tkzGetPoint{C}
 \tkzDefCircle[through](A,C)
 \tkzGetLength{rACpt}
 \tkzpttocm(\rACpt){rACcm}
 \tkzDrawCircle(A,C)
 \tkzDrawPoints(A,B,C)
 \tkzLabelPoints(A,B,C)
 \tkzLabelCircle[draw,fill=orange,
          text width=3cm,text centered,
          font=\scriptsize](A,C)(-90)%
 {The radius measurement is:
  \rACpt pt i.e. \rACcm cm}
\end{tikzpicture}

\end{document}