\input{preamble-standalone.ltx} \begin{document} % Ex. No. 95 (Section 13.2.1 : Example with \tkzcname{tkzLabelLine}) \begin{tikzpicture} \tkzDefPoints{0/0/A,3/0/B,1/1/C} \tkzDefLine[perpendicular=through C,K=-1](A,B) \tkzGetPoint{c} \tkzDrawLines(A,B C,c) \tkzLabelLine[pos=1.25,blue,right](C,c){$(\delta)$} \tkzLabelLine[pos=-0.25,red,left](C,c){again $(\delta)$} \end{tikzpicture} \end{document}