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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 40 (Section 6.1.5 : Option \tkzname{ex})
\begin{tikzpicture}[scale=.5]
\tkzDefPoints{0/1/A,3/2/B,1/4/C}
\tkzDefTriangleCenter[ex](B,C,A)
\tkzGetPoint{J_c}
\tkzDefPointBy[projection=onto A--B](J_c)
\tkzGetPoint{Tc}
%or
% \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}
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