\input{preamble-standalone.ltx} \begin{document} % Ex. No. 122 (Section 16.0.7 : Option \tkzname{tangential}) \begin{tikzpicture}[scale=.5,rotate=80] \tkzDefPoints{0/0/A,6/0/B,1.8/4/C} \tkzDefSpcTriangle[tangential, name=T](A,B,C){_a,_b,_c} \tkzDrawPolygon[red](A,B,C) \tkzDrawPolygon[blue](T_a,T_b,T_c) \tkzDrawPoints[red](A,B,C) \tkzDrawPoints[blue](T_a,T_b,T_c) \tkzDefCircle[circum](A,B,C) \tkzGetPoint{O} \tkzDrawCircle(O,A) \tkzLabelPoints[red](A,B,C) \tkzLabelPoints[blue](T_a,T_b,T_c) \end{tikzpicture} \end{document}