\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}[Miquel Point Theorem]
Four lines form four triangles. Show that the circumcircles of the four triangles passes through a common point.
\end{geothm}
nd{document}
