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

% Ex. No. 165 (Section 20.2.7 : Calculation of radius example 3)

\begin{tikzpicture}
	\tkzDefPoints{2/2/A,5/4/B,4/4/0}
  \tkzLength=2cm
  \tkzDrawCircle[R](O,\tkzLength)
  \tkzInterLC[R](A,B)(O,\tkzLength)
  \tkzGetPoints{I}{J}
  \tkzDrawPoints[color=blue](A,B)
  \tkzDrawPoints[color=red](I,J)
  \tkzDrawLine(I,J)
\end{tikzpicture}

\end{document}