6-4-2.ty

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% 6-4-2.ty
\documentclass{article}
\input tdw
\begin{document}
\setlength{\unitlength}{1mm}
\begin{center}
\begin{picture}(70,28)(-3,-3)\small
\put(-3,0){\vector(1,0){70}}
\put(0,-3){\vector(0,1){28}}
\put(0,0){\draw0,0,{width(0.4),
trace(0.01,2pi-0.01,10(t-sin(t)),10(1-cos(t))),
width(0.2),
circle(15.7,10,10),
polygon(5.7,10,15.7,10,15.7,0),
trace(pi,1.5pi,15.7+3cos(t),10+3sin(t)),
write(-0.5,-0.5)[rt]{$O$},
write(20pi,-1)[t]{$A$},
write(12.7,8)[rt]{$\theta$}}}
\end{picture}
\end{center}
\end{document}