\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)(7,6)%
\pstGeonode[PosAngle={-60,-60,0,30}](1,1){A}(5,3){B}(3,3){O}(4,4){C}%
\pcline[nodesep=-10](A)(B)%
\pstCircleOA{O}{C}%
\pstInterLC[PointNameA=I_1,PointNameB=I_2,PosAngleA=-90,PosAngleB=-30]{A}{B}{O}{C}{I1}{I2}%
\pscircle[linecolor=red](O){2.5}%
\pstInterLC[Radius=\pstDistVal{2.5},linecolor=red,PosAngleA=70,PosAngleB=150]{A}{B}{O}{}{J1}{J2}%
\end{pspicture*}
\end{footnotesize}
\end{document}
