% !TeX TXS-program:compile = txs:///pdflatex

\documentclass[margin=5mm]{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[x={(0:1cm)},y={(30:0.5cm)},z={(90:1cm)},line join=bevel]
	\coordinate (H) at (0,0,0) ; \draw (H) node[below left] {$H$} ;
	\coordinate (G) at (4,0,0) ; \draw (G) node[below right] {$G$} ;
	\coordinate (C) at (4,4,0) ; \draw (C) node[right] {$C$} ;
	\coordinate (D) at (0,4,0) ; \draw (D) node[below right] {$D$} ;
	\coordinate (E) at (0,0,4) ; \draw (E) node[left] {$E$} ;
	\coordinate (F) at (4,0,4) ; \draw (F) node[above] {$F$} ;
	\coordinate (B) at (4,4,4) ; \draw (B) node[above] {$B$} ;
	\coordinate (A) at (0,4,4) ; \draw (A) node[above] {$A$} ;
	\draw[semithick,dashed] (H)--(D) (A)--(D)--(C) ;
	\draw[semithick] (H)--(G)--(C)--(B)--(F)--(G) ;
	\draw[semithick] (H)--(E)--(A)--(B)--(F)--(E) ;
\end{tikzpicture}

\end{document}