\documentclass[11pt]{article}
\usepackage{geometry}                % See geometry.pdf to learn the layout options. There are lots.
\geometry{letterpaper}                   % ... or a4paper or a5paper or ... 
%\geometry{landscape}                % Activate for for rotated page geometry
%\usepackage[parfill]{parskip}    % Activate to begin paragraphs with an empty line rather than an indent
\usepackage{graphicx}
\usepackage{amssymb,amsmath}
\usepackage{epstopdf}
\usepackage{pgf}
\usepackage{pgfpages}
\usepackage{tikz}
\usetikzlibrary{arrows,backgrounds}
\usepgflibrary{shapes}
\DeclareGraphicsRule{.tif}{png}{.png}{`convert #1 `dirname #1`/`basename #1 .tif`.png}
\pagestyle{empty}

\begin{document}


% Quadrilateral Edge
 \begin{center}
  \begin{tikzpicture}
     \node[name=p4, regular polygon,regular polygon sides=4, minimum size=4cm, draw, thick, fill=black!10]{};
      \filldraw(p4.corner 1) circle (2pt);
      \filldraw(p4.corner 2) circle (2pt);
      \filldraw(p4.corner 3) circle (2pt);
      \filldraw(p4.corner 4) circle (2pt);
     \node[above] at (p4.side 1){2};
     \node[left] at (p4.side 2){3};
     \node[below] at (p4.side 3){0};
     \node[right] at (p4.side 4){1};
  \end{tikzpicture}
 \end{center}

\end{document}  
