\input{preamble-standalone.ltx} \begin{document} % Ex. No. 97 (Section 14.1.2 : Example of extending an segment with option \tkzname{add}) \begin{tikzpicture} \tkzDefPoints{0/0/A,6/0/B,0.8/4/C} \tkzDefTriangleCenter[euler](A,B,C) \tkzGetPoint{E} \tkzDrawCircle[euler,red](A,B,C) \tkzDrawLines[add=.5 and .5](A,B A,C B,C) \tkzDrawPoints(A,B,C,E) \tkzLabelPoints(A,B,C,E) \end{tikzpicture} \end{document}