6-2-6.tex

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% 6-2-6.tex
\documentclass{article}
\begin{document}
\setlength{\unitlength}{1mm}
\begin{center}
\begin{picture}(41,21)(-0.5,-0.5)
\put(0,0){\circle*{1}}    
\put(0,20){\circle*{1}} 
\put(40,20){\circle*{1}}  
\qbezier[20](0,0)(0,10)(0,20)  
\qbezier[40](0,20)(20,20)(40,20) 
\qbezier(0,0)(0,20)(40,20)
\put(1,0){\makebox(0,0)[bl]{(0,0)}}
\put(1,19){\makebox(0,0)[tl]{(0,20)}}
\put(40,18.5){\makebox(0,0)[tr]{(40,20)}}
\end{picture}\end{center}
\end{document}