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\begin{tikzpicture}[scale=.4]
\tkzDefPoints{% x y name
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[](A,B,C)
\tkzDefTriangleCenter[nagel](A,B,C)
\tkzGetPoint{Na}
\tkzDrawPoints(B,C,A,Na)
\tkzLabelPoints(B,C,A,Na)
\tkzShowBB\tkzClipBB
\tkzDrawLines[add=1 and 1,dashed](A,B B,C C,A)
\tkzDrawCircles[dashed](Ja,Ta Jb,Tb Jc,Tc)
\tkzDrawSegments[dashed](Ja,Ta Jb,Tb Jc,Tc)
\tkzMarkRightAngles[fill=gray!20](Ja,Ta,C
Jb,Tb,A Jc,Tc,B)
\end{tikzpicture}
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