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

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

\begin{document}

\begin{tikzpicture}[x=5cm,y=5cm,line join=bevel]
	\PaveTikz[Aff,Cube,Largeur=1,Angle=20,Fuite=0.33,Epaisseur={very thick}]
	\draw[thick] (0,0)--(0.5,1)--(G) ;
	\draw[thick,dotted] (A)--(G) ;
	\foreach \i in {A,B,C,D,E,F,G,H} \filldraw (\i) circle[radius=2pt] ;
	\filldraw ($(A)!0.5!(H)$) circle[radius=2pt] node[left] {K} ;
	\filldraw ($(E)!0.5!(F)$) circle[radius=2pt] node[above left] {I} ;
	\filldraw ($(A)!0.5!(G)$) circle[radius=2pt] node[below] {O} ;
\end{tikzpicture}

\end{document}