\input{preamble-standalone.ltx} \begin{document} % Ex. No. 69 (Section 13.1.2 : Example avec \tkzname{orthogonal} et \tkzname{parallel}) \begin{tikzpicture} \tkzDefPoints{-1.5/-0.25/A,1/-0.75/B,-0.7/1/C} \tkzDrawLine(A,B) \tkzLabelLine[pos=1.25,left](A,B){$(d_1)$} \tkzDrawPoints(A,B,C) \tkzDefLine[orthogonal=through C](B,A) \tkzGetPoint{c} \tkzDrawLine(C,c) \tkzLabelLine[pos=1.25,left](C,c){$(\delta)$} \tkzInterLL(A,B)(C,c) \tkzGetPoint{I} \tkzMarkRightAngle(C,I,B) \tkzDefLine[parallel=through C](A,B) \tkzGetPoint{c'} \tkzDrawLine(C,c') \tkzLabelLine[pos=1.25,left](C,c'){$(d_2)$} \tkzMarkRightAngle(I,C,c') \end{tikzpicture} \end{document}