\documentclass{beamer}

\input{support/header}

\newcommand{\rpfeil}[2][6mm]{%
  \tikz{\path[x=#1, y=#1, fill=black, draw=black, line width=1mm] 
    (0,0) |- ++(#2) -- ++(0,1) -- ++(3,-3) -- ++(-3,-3) -- ++(0,1)
    -| (4,0) -- (0,0);}}

\begin{document}

\begin{frame}
~ \vfill
\defaulthead{${ form.headline }}
\vskip.5cm
\begin{columns}
\column{.45\textwidth}
	\centering
	\rpfeil[15mm]{6,6}
\column{.55\textwidth}
	\includegraphics[width=\linewidth]{${ form.img }}
\end{columns}
\vfill ~
\end{frame}

\end{document}