\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}