\documentclass[a4paper,11pt]{article}
\usepackage{gclc}
\usepackage{graphicx}

\newtheorem{geothm}{Theorem}


\begin{document}


\begin{geothm}[The Orthocenter Theorem] 
  Let $\Delta ABC$ be a triangle, them the three altitudes of it are
  concurrent.
\end{geothm}



GCLC

\begin{center}
  \input{geo15.pic}
\end{center}


\end{document}

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