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

% Ex. No. 61 (Section 10.1.2 : Option \tkzname{colinear at} with $K$)

\begin{tikzpicture}[vect/.style={->,
	             shorten >=3pt,>=latex'}]
  \tkzDefPoint(0,0){A}
  \tkzDefPoint(5,0){B}
  \tkzDefPoint(1,2){C}
  \tkzDefPointWith[colinear=at C](A,B)
  \tkzGetPoint{G}
  \tkzDefPointWith[colinear=at C,K=0.5](A,B)
  \tkzGetPoint{H}
  \tkzLabelPoints(A,B,C,G,H)
  \tkzDrawPoints(A,B,C,G,H)
	\tkzDrawSegments[vect](A,B C,H)
\end{tikzpicture}

\end{document}