\documentclass[12pt,a4paper,fleqn]{report}
\setlength{\hoffset}{-1cm}
\setlength{\voffset}{-1.3cm}
\setlength{\oddsidemargin}{0cm}
 \setlength{\topmargin}{0.5cm}
% \setlength{\headheight}{0cm}
\setlength{\headheight}{1cm}
% \setlength{\headsep}{-0.5cm}
\setlength{\headsep}{1.5cm}
% \setlength{\textheight}{26cm}
\setlength{\textheight}{24cm}
\setlength{\textwidth}{18cm}
\setlength{\marginparsep}{0cm}
\setlength{\marginparwidth}{0cm}
\setlength{\footskip}{0cm}
\setlength{\marginparwidth}{0cm}

\newcommand{\tmop}[1]{\operatorname{#1}}
\usepackage{pstricks}
\usepackage{pstcol}
\usepackage{pst-char}
\usepackage{pst-text}
\usepackage{pst-fill}
\usepackage{enumerate}
\usepackage{fontenc}
\usepackage{ulem}
\usepackage{amsmath}
\usepackage[francais]{babel}
%%%%%%%%%%%%%%%%
%\usepackage[latin1]{inputenc}
\usepackage[utf8]{inputenc}
%%%%%%%%%%%%%%%%%
\usepackage[dvips,final]{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{pstricks,pst-plot,pst-text}
\usepackage{theorem}
\usepackage{picins}
\newcommand{\C}{\text{Cot}}
\usepackage{fancyhdr}
\newtheorem{lm}{Lemme}
\newtheorem{propr}{Propriété}
\newtheorem{propo}{Proposition}
\newtheorem{pb}{Problème}
\newtheorem{dem}{Démonstration}
\newtheorem{sdem}{Suite Démonstration}
\newtheorem{df}{Définition}
\newtheorem{rem}{Remarque}
\newtheorem{theo}{Théorème}
\font\tresgros=cmbx12 at 36pt
\title{\tresgros{Inégalités géométriques dans le plan euclidien}}
\author{\Large Arnaud \textsc{Durand}}
% \DeclareGraphicsExtensions{,ps,eps}