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

% Ex. No. 30 (Section  6.1.5 : \IoptName{tkzDefTriangleCenter}{ex})

\begin{tikzpicture}[scale=.5]
  \tkzDefPoints{0/1/A,3/2/B,1/4/C}
  \tkzDefCircle[ex](B,C,A)
  \tkzGetFirstPoint{J_c}
  \tkzGetSecondPoint{Tc}
  \tkzDrawPolygon[color=blue](A,B,C)
  \tkzDrawPoints(A,B,C,J_c)
  \tkzDrawCircle[red](J_c,Tc)
  \tkzDrawLines[add=1.5 and 0](A,C B,C)
  \tkzLabelPoints(J_c)
\end{tikzpicture}

\end{document}
