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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 117 (Section 16.0.2 : Option \tkzname{in} or \tkzname{incentral} )
\begin{tikzpicture}[scale=1]
\tkzDefPoints{ 0/0/A,5/0/B,1/3/C}
\tkzDefSpcTriangle[in,name=I](A,B,C){_a,_b,_c}
\tkzInCenter(A,B,C)\tkzGetPoint{I}
\tkzDrawPolygon[red](A,B,C)
\tkzDrawPolygon[blue](I_a,I_b,I_c)
\tkzDrawPoints(A,B,C,I,I_a,I_b,I_c)
\tkzDrawCircle[in](A,B,C)
\tkzDrawSegments[dashed](A,I_a B,I_b C,I_c)
\tkzAutoLabelPoints[center=I,
blue,font=\scriptsize](I_a,I_b,I_c)
\tkzAutoLabelPoints[center=I,red,
font=\scriptsize](A,B,C,I_a,I_b,I_c)
\end{tikzpicture}
\end{document}
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