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

% Ex. No. 218 (Section 27.1.1 : Example of \tkzcname{tkzShowLine} and \tkzname{parallel})

\begin{tikzpicture}
 \tkzDefPoints{-1.5/-0.25/A,1/-0.75/B,-1.5/2/C}
 \tkzDrawLine(A,B)
 \tkzDefLine[parallel=through C](A,B) \tkzGetPoint{c}
 \tkzShowLine[parallel=through C](A,B)
 \tkzDrawLine(C,c) \tkzDrawPoints(A,B,C,c)
\end{tikzpicture}

\end{document}