% 1. Definition of characteristic points

\figinit{1.5cm}

\def\coteii{2.23}
\def\dimsq{.1}

\figpt 1:(0,0)
\figpt 2:(\coteii,0)
\figpt 3:(0,-\coteii)
\figptbary 4:[1,2,3;1,1,1]
\figptbary 5:[2,3;1,1]
\figptbary 6:[1,2,3;2,-1,0]
\figptbary 7:[1,2,3;2,-1,2]
\figptbary 8:[4,7;1,1]
\figvectN 0 [4,7]
\figpttra 9:=8/1.6,0/
\figpttra 10:=8/-1.6,0/
\figget distance=\ri[1,7]
\figptbary 11:[1,7;1,-2]

% 2. Creation of the graphical file

\figdrawbegin{}

\figset(dash=4)
\figdrawline[1,5]
\figset altitude(sqdash=1)
\figdrawaltitude \dimsq[1,5,2]
\figset(dash=default)
\figdrawaltitude \dimsq[4,8,10]
\figdrawline[8,7]
\figdrawline[1,2,3,1]
\figdrawline[1,3,6,1]
\figdrawline[1,7]
\figdrawline[9,10]
\figdrawcirc 7(\ri)

\figdrawend

% 3. Writing text on the figure

\def\disti{3pt}

\figvisu{\figBoxA}{Figure 2}{%
\figwritene 1:$A$(\disti)
\figwritene 2:$B$(\disti)
\figwrites 3:$C$(\disti)
\figwritene 4:$I$(\disti)
\figwritese 5:$H$(\disti)
\figwritenw 6:$G_{0}$(\disti)
\figwritesw 7:$G_{2}$(\disti)
\figwritene 10:$\Gamma_{1}$(\disti)
\figwrites 11:$\Gamma_{2}$(\disti)
}
\centerline{\box\figBoxA}