\documentclass[12pt,a4paper]{article}
\usepackage[francais]{babel}
\usepackage{mafr}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{lmodern}
\usepackage[dvipsnames]{xcolor}
\usepackage{pstricks}
\usepackage{pst-eucl}
\begin{document}
\begin{footnotesize}
\begin{pspicture}(0,0)(9,5)%
\psset{PointNameSep=.8em,linewidth=.5pt}%
\pstGeonode(4,2){A}(1,0.5){B}(2,2){C}%
\psline(A)(B)(C)%
\pstMarkAngle[LabelSep=.7]{A}{B}{C}{$\beta$}%
\pstGeonode(5,1){S}(8,2){D}%
\pstRotation[RotAngle=\pstAngleAOB{A}{B}{C},CodeFig=true,TransformLabel=\beta]{S}{D}%
\pstRotation[AngleCoef=2,RotAngle=\pstAngleAOB{A}{B}{C},CodeFig=true]{S}{D}[D'']%
\end{pspicture}
\end{footnotesize}
\end{document}
