\input{preamble-standalone.ltx} \begin{document} % Ex. No. 119 (Section 16.0.4 : Option \tkzname{intouch}) \begin{tikzpicture}[scale=.75] \tkzDefPoints{0/0/A,6/0/B,0.8/4/C} \tkzDefSpcTriangle[intouch,name=X](A,B,C){_a,_b,_c} \tkzInCenter(A,B,C)\tkzGetPoint{I} \tkzDrawPolygon[red](A,B,C) \tkzDrawPolygon[blue](X_a,X_b,X_c) \tkzDrawPoints[red](A,B,C) \tkzDrawPoints[blue](X_a,X_b,X_c) \tkzDrawCircle[in](A,B,C) \tkzAutoLabelPoints[center=I,blue,font=\scriptsize]% (X_a,X_b,X_c) \tkzAutoLabelPoints[center=I,red,font=\scriptsize]% (A,B,C) \end{tikzpicture} \end{document}