\documentclass[tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
%The flag of the People's Republic of Bangladesh
\begin{document}
\definecolor{red}{RGB}{244,42,65}
\definecolor{green}{RGB}{0,106,78}
\noindent
\begin{tikzpicture}
% Use wikipedia's dimensions
\fill[green] rectangle (10, 6);
\fill[red] (4.5,3) circle (2);
\end{tikzpicture}
\end{document}
