\input{preamble-standalone.ltx} \begin{document} % Ex. No. 57 (Section 11.1.9 : \tkzcname{tkzDefPointWith} et \tkzname{orthogonal normed} K=2) \begin{tikzpicture}[scale=1.2, vect/.style={->,shorten >=3pt,>=latex'}] \tkzDefPoint(2,3){A} \tkzDefPoint(5,1){B} \tkzDefPointWith[orthogonal normed,K=2](A,B) \tkzGetPoint{C} \tkzDrawPoints[color=red](A,B,C) \tkzDrawCircle[R](A,2cm) \tkzDrawSegments[vect](A,B A,C) \tkzMarkRightAngle[fill=gray!20](B,A,C) \tkzLabelPoints[above=3pt](A,B,C) \end{tikzpicture} \end{document}