\documentclass[12pt]{article}

\usepackage{pictexwd,amsmath,amssymb,epsfig,fullpage}
\pagestyle{empty}

\begin{document}
\begin{center}
{\Large{\bf The Area of a Circle}} \\
\end{center}

\noindent
{\large How does the diagram below justify the area formula for a circle?}
\begin{center}
\epsfysize 4in
\epsffile{pictures/yarncircle}
\end{center}

\begin{center}
\epsfysize 2in
\epsffile{pictures/unrollyarn}
\end{center}



\end{document}
