\documentclass{ppex}
\nonstopmode
\usepackage {pstcol,pstpoly}
\pagestyle{empty}

\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {pstcol,pstpoly}
\PstRegularPolygon
\PstRegularPolygon[RPolyNbSides=11]
\PstRegularPolygon[RPolyOffset=2]
\PstRegularPolygon[linecolor=red,RPolyIntermediatePoint=0.2]
\PstRegularPolygon[linestyle=dashed,RPolyCurves,RPolyOffset=2,
     RPolyIntermediatePoint=0.75]

\PstRegularPolygon[unit=2,RPolyNbSides=9,RPolyOffset=2]
\PstRegularPolygon[unit=2,RPolyNbSides=27,RPolyOffset=7,RPolyCurves,
   RPolyIntermediatePoint=0.1]
\end{document}