\documentclass[10pt,envcountsect]{beamer}

\mode<presentation> {
  \usetheme{Warsaw}
}

\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{times}
\usepackage[T1]{fontenc}
\usepackage{pst-all}
\usepackage{multicol}



\begin{document}

\title{Episode 15 -- Cross sections of a tetrahedron}
\subtitle{European section -- Season 2}
\author{}
\date{}

\begin{frame}
  \titlepage
\end{frame}


\begin{frame}{What is a cross section ?}

\large

\begin{block}{Cross section}
In geometry, a cross section is the intersection of a 3-dimensional body with a plane.
\end{block}\pause

\begin{center}
\includegraphics[width=6cm]{images/cheese.eps}
\end{center}

\end{frame}

\begin{frame}{Cross sections of a sphere}

\begin{center}
\large See picture and animation with DP Graph.
\end{center}

\end{frame}



\end{document}
