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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 39 (Section 6.1.4 : Option \tkzname{in})
\begin{tikzpicture}
\tkzDefPoints{0/1/A,3/2/B,1/4/C}
\tkzDefTriangleCenter[in](A,B,C)\tkzGetPoint{I}
\tkzDefPointBy[projection=onto A--C](I)
\tkzGetPoint{Ib}
\tkzDrawPolygon[color=blue](A,B,C)
\tkzDrawPoints(A,B,C,I)
\tkzDrawLines[add = 0 and 2/3](A,I B,I C,I)
\tkzDrawCircle(I,Ib)
\end{tikzpicture}
\end{document}
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