\documentclass[12pt]{article}
\usepackage[latin1]{inputenc}
\def\ratio#1#2{\frac{\overline{#1}}{\overline{#2}}}
\newtheorem{geothm}{Theorem}
\pagestyle{empty}
\addtolength{\textwidth}{2cm}
\begin{document}
\large
\begin{geothm}
 Show that median $CM$ divides triangle
 $ABC$ into two triangles of the same
 area.
\end{geothm}
nd{document}
