\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 63 (Section 10.1.4 : Option \tkzname{orthogonal})

\begin{tikzpicture}[scale=1.2,
  vect/.style={->,shorten >=3pt,>=latex'}]
   \tkzDefPoint(2,3){A}
	   \tkzDefPoint(4,2){B}
   \tkzDefPointWith[orthogonal,K=1](A,B)
     \tkzGetPoint{C}
   \tkzDrawPoints[color=red](A,B,C)
   \tkzLabelPoints[right=3pt](B,C)
   \tkzLabelPoints[below=3pt](A)
   \tkzDrawSegments[vect](A,B A,C)
   \tkzMarkRightAngle(B,A,C)
\end{tikzpicture}

\end{document}