trapezoid

A trapezoid is a quadrilateral with one pair of parallel sides and the other pair are congruent.

\documentclass[tikz]{standalone}
\usepackage{tkz-euclide}
%
\begin{document}
\begin{tikzpicture}
    \tkzDefPoint(0,0){A}
    \tkzDefPoint(8,0){B}
    \tkzDefPoint(6,4){C}
    \tkzDefPoint(2,4){D}
    %   \tkzDrawPolygon(A,B,C,D)
    \begin{scope}[decoration={
        markings,
        mark=at position 0.525 with {\arrow{Stealth}}}
        ] 
        \tkzDrawSegments[postaction={decorate}, very thick](D,C)
    \end{scope}
    \begin{scope}[decoration={
        markings,
        mark=at position 0.5 with {\arrow{Stealth}},
        mark=at position 0.55 with {\arrow{Stealth}}}
        ] 
        \tkzDrawSegments[postaction={decorate}, very thick](A,B)
    \end{scope}
    \tkzDrawSegments[very thick](D,A C,B)
	%
	\tkzMarkSegments[mark=|](D,A C,B)
\end{tikzpicture}
\end{document}