\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
    \draw (0,0) -- (0,2);
    \draw (0,2) -- (5,0);
    \draw (5,0) -- (0,0);
    \draw (0,2) -- (5,2);
    \draw (5,2) -- (5,0);
    \draw (5,2) -- (0,0);
\end{tikzpicture}
\end{document}