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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 43 (Section 6.1.8 : Option \tkzname{nagel})
\begin{tikzpicture}[scale=.5]
\tkzDefPoints{0/0/A,6/0/B,4/6/C}
\tkzDefSpcTriangle[ex](A,B,C){Ja,Jb,Jc}
\tkzDefSpcTriangle[extouch](A,B,C){Ta,Tb,Tc}
\tkzDrawPoints(Ja,Jb,Jc,Ta,Tb,Tc)
\tkzLabelPoints(Ja,Jb,Jc,Ta,Tb,Tc)
\tkzDrawPolygon[blue](A,B,C)
\tkzDefTriangleCenter[nagel](A,B,C) \tkzGetPoint{Na}
\tkzDrawPoints[blue](B,C,A)
\tkzDrawPoints[red](Na)
\tkzLabelPoints[blue](B,C,A)
\tkzLabelPoints[red](Na)
\tkzDrawLines[add=0 and 1](A,Ta B,Tb C,Tc)
\tkzShowBB\tkzClipBB
\tkzDrawLines[add=1 and 1,dashed](A,B B,C C,A)
\tkzDrawCircles[ex,gray](A,B,C C,A,B B,C,A)
\tkzDrawSegments[dashed](Ja,Ta Jb,Tb Jc,Tc)
\tkzMarkRightAngles[fill=gray!20](Ja,Ta,C
Jb,Tb,A Jc,Tc,B)
\end{tikzpicture}
\end{document}
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