%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-7-17 on page 248.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{111.83385pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,3)
  \pscurve[showpoints=true,linecolor=red,
     linewidth=1.5pt](0,1)(2,2.5)(3,0)
  \pspolygon[linewidth=0.3pt](0,1)(2,2.5)(3,0)
  \rput[lC]{-105.7}(2,2.5){
    \psset{linewidth=0.2pt}
    \psline[linestyle=dashed](0,-1)(0,1)
    \psline[linestyle=dashed](0,0)(1.5,0)
    \psarc(0,0){0.25}{0}{90}}
  \uput[-75](0,1){A}\uput[135](3,0){B}\uput[45](2,2.5){C}
\end{pspicture}
\end{document}