\input{preamble-standalone.ltx} \begin{document} % Ex. No. 117 (Section 16.0.2 : Option \tkzname{in} or \tkzname{incentral} ) \begin{tikzpicture}[scale=1] \tkzDefPoints{ 0/0/A,5/0/B,1/3/C} \tkzDefSpcTriangle[in,name=I](A,B,C){_a,_b,_c} \tkzInCenter(A,B,C)\tkzGetPoint{I} \tkzDrawPolygon[red](A,B,C) \tkzDrawPolygon[blue](I_a,I_b,I_c) \tkzDrawPoints(A,B,C,I,I_a,I_b,I_c) \tkzDrawCircle[in](A,B,C) \tkzDrawSegments[dashed](A,I_a B,I_b C,I_c) \tkzAutoLabelPoints[center=I, blue,font=\scriptsize](I_a,I_b,I_c) \tkzAutoLabelPoints[center=I,red, font=\scriptsize](A,B,C,I_a,I_b,I_c) \end{tikzpicture} \end{document}