\input{preamble-standalone.ltx} \begin{document} % Ex. No. 33 (Section 6.1.8 : Using option \IoptName{tkzDefTriangleCenter}{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}