6-4-1.ty

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% 6-4-1.ty
\documentclass{article}
\input tdw
\begin{document}
\setlength{\unitlength}{1mm}
\begin{center}
\begin{picture}(56,26)(-3,-3)\small
\put(0,0){\draw0,0,{width(.3),
polygon(39,0,0,0,11,20),
line(0,0,50,20),
arrowheadd(39,0,1,0,2,10),
arrowheadd(50,20,50,20,2,10),
arrowheadd(11,20,11,20,2,10),
dotted(6,7),
width(0.1),
polygon(39,0,50,20,11,20),
write(-0.5,-0.5)[rt]{$O$},
write(39,-1)[t]{$A$},
write(11,21)[b]{$B$},
write(50,21)[b]{$C$}}}
\end{picture}

\vspace{1cm}
\setlength{\unitlength}{0.5mm}
\begin{picture}(56,26)(-3,-3)\small
\put(0,0){\draw0,0,{width(.3),
ratio(0.5),
polygon(39,0,0,0,11,20),
line(0,0,50,20),
arrowheadd(39,0,1,0,2,10),
arrowheadd(50,20,50,20,2,10),
arrowheadd(11,20,11,20,2,10),
dotted(6,7),
width(0.1),
polygon(39,0,50,20,11,20),
write(-0.5,-0.5)[rt]{$O$},
write(39,-1)[t]{$A$},
write(11,21)[b]{$B$},
write(50,21)[b]{$C$}}}
\end{picture}
\end{center}
\end{document}