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

% Ex. No. 20 (Section  4.4 : Create a triangle)

\begin{tikzpicture}[scale=1]
 \tkzDefPoints{0/0/A,4/0/B,4/3/C}
 \tkzDrawPolygon(A,B,C)
 \tkzDrawPoints(A,B,C)
\end{tikzpicture}

\end{document}
