\input{preamble-standalone.ltx} \begin{document} % Ex. No. 120 (Section 16.0.5 : Option \tkzname{extouch}) \begin{tikzpicture}[scale=.7] \tkzDefPoints{0/0/A,6/0/B,0.8/4/C} \tkzDefSpcTriangle[excentral, name=J](A,B,C){_a,_b,_c} \tkzDefSpcTriangle[extouch, name=T](A,B,C){_a,_b,_c} \tkzDefTriangleCenter[nagel](A,B,C) \tkzGetPoint{N_a} \tkzDefTriangleCenter[centroid](A,B,C) \tkzGetPoint{G} \tkzDrawPoints[blue](J_a,J_b,J_c) \tkzClipBB \tkzShowBB \tkzDrawCircles[gray](J_a,T_a J_b,T_b J_c,T_c) \tkzDrawLines[add=1 and 1](A,B B,C C,A) \tkzDrawSegments[gray](A,T_a B,T_b C,T_c) \tkzDrawSegments[gray](J_a,T_a J_b,T_b J_c,T_c) \tkzDrawPolygon[blue](A,B,C) \tkzDrawPolygon[red](T_a,T_b,T_c) \tkzDrawPoints(A,B,C,N_a) \tkzLabelPoints(N_a) \tkzAutoLabelPoints[center=Na,blue](A,B,C) \tkzAutoLabelPoints[center=G,red, dist=.4](T_a,T_b,T_c) \tkzMarkRightAngles[fill=gray!15](J_a,T_a,B J_b,T_b,C J_c,T_c,A) \end{tikzpicture} \end{document}