\input{preamble-standalone.ltx} \begin{document} % Ex. No. 67 (Section 10.1.8 : Option \tkzname{orthogonal normed}, $K=1$) \begin{tikzpicture}[scale=1.2, vect/.style={->,shorten >=3pt,>=latex'}] \tkzDefPoint(2,3){A} \tkzDefPoint(4,2){B} \tkzDefPointWith[orthogonal normed](A,B) \tkzGetPoint{C} \tkzDrawPoints[color=red](A,B,C) \tkzDrawSegments[vect](A,B A,C) \tkzMarkRightAngle[fill=gray!20](B,A,C) \end{tikzpicture} \end{document}