\documentclass{article}
\usepackage{web}
\margins{0pt}{0pt}{0pt}{0pt}   %% Kein Seitenrand
\screensize{180mm}{270mm}      %% Dimensionen: H\"{o}he, Breite des Dokuments

\parindent0pt

\usepackage{pstricks,pst-eucl,pstricks-add}

\definecolor{turkeyRed}{HTML}{CE1126}


\begin{document}

\thispagestyle{empty}

\begin{pspicture}(0,0)(27,18)
%% Flagge (Verh\"{a}ltnis 3 Breite : 2 H\"{o}he)

\pnode(9,9){M1}
\pnode(4.5,9){A1}
\pnode(!9 1 16 div 18 mul add 9){M2}
\pnode(!9 1 16 div 18 mul add 1 5 div 18 mul sub 9){A2}
\psframe[linecolor=turkeyRed,fillstyle=solid,fillcolor=turkeyRed](0,0)(27,18)
\pscircle[linecolor=white,fillstyle=solid,fillcolor=white](M1){4.5}
\pscircle[linecolor=turkeyRed,fillstyle=solid,fillcolor=turkeyRed](M2){!1 5 div 18 mul}

\pnode(0,9){A}
\pnode(27,9){B}

\pstInterCC[PointName=none,PointSymbol=none]{M1}{A1}{M2}{A2}{S1}{S2}
\pstInterLL[PointName=none,PointSymbol=none]{A}{B}{S1}{S2}{D}
\rput(D){\rput(2.25,0){%
\pspolygon[linecolor=white,fillstyle=solid,fillcolor=white](2.25;180)(2.25;-36)(2.25;108)(2.25;252)(2.25;36)
}}

\end{pspicture}
\end{document}
