Especially for greater hexagons I wrote a new command \myHexagon{radian}, which draws with the package PSTricks hexagons in any size. The parameter is the radius of the surrounding circle. \myHexagon{2.5cm} gives a hexagon with diameter of 6cm of the surrounding circle: The hexagon is like a single character with the same baseline. The latex preamble looks like:

\usepackage{wasysym}
\usepackage{pstricks}
\newlength{\myL}
\newcommand\myHexagon[1]{%
  \setlength{\myL}{#1}
  \psset{unit=1.0}
  \begin{pspicture}(-0.9511\myL,-0.8090\myL)(0.9511\myL,\myL)
  \psline[linewidth=1pt](0.5\myL,-0.866\myL)(-0.5\myL,-0.866\myL)(-\myL,0)(-0.5\myL,0.866\myL)%
  (0.5\myL,0.866\myL)(\myL,0)(0.5\myL,-0.866\myL)
  \end{pspicture}%
}

1. 2cm
2. 3inch
3. 12pt