\input fig4tex

% 1. Definition of characteristic points
\figinit{cm}
\figpt 0:(0,0)
\figpt 1:(-0.5, -2.46)
\figpt 2:(-2.8952, 0.786)
\figptrot 3:=2/0,-120/
\figpttraC 4:= 3 /0.5,-3/
% 2. Creation of the graphical file
\figdrawbegin{}
\figset (width=0.8)
% Polygonal part of the figure
\figdrawline[3,4,1,2]
% Circular arc
\figget distance=\Radius[0,2]
\figdrawarccircP 0 ; \Radius [3,2]
%
\figset (width=default)
% Double arrows to show the dimensions
\figdrawdim 2,1(-0.5)
\figdrawdim 1,4(-0.5)
\figset arrowhead(fill=yes)
\figdrawdim 3,4(0.5)
% Dashed line to show the radius of the arc
\figset (dash=4)
\figptcirc 5 :: 0 ; \Radius (140)
\figdrawline[0,5]
\figdrawend
% 3. Writing text on the figure
\figvisu{\figBoxA}{}{%
\figset write (rounding=3)
% Dimensions of the edges of the polygon
\figwritedim 2,1:(-0.5)
\figwritedim 1,4:(-0.5)
\figwritedim 3,4:(0.5)
% Center of the arc and its radius
\figwritec[0]{+}
\figwritedim 5,0:\figround{\Radius}(0)
}
\centerline{\box\figBoxA}
\bye