% Archimedean spiral: r=0,5t
\SCALEfunction{0.5}{\IDENTITYfunction}{\ffunction}
\POLARfunction{\ffunction}{\archimedes}

\MULTIPLY{2}{\numberTWOPI}{\numberFOURPI}
\setlength{\unitlength}{0.5cm}
\begin{center}
\begin{Picture}(-7,-7)(7,7)
\pictcolor{red}
\PlotParametricFunction[16]{%
                \archimedes}{0}{\numberFOURPI}
\end{Picture}
$2\rho=\phi$
\end{center}
