10.2.1 Edges



  \begin{texgraph}[name=Aretes, export=pgf]
   view(-2,3,-2,4.5),Marges(0,0,0,0),size(7.5),
   plan:=[M(1.5,0,0), -vecI],
   S:= Section(plan,
         Tetra(Origin,3*vecI,3*vecJ,4*vecK)),
   A:=Aretes(S), Width:=12, DrawAretes(A)
  \end{texgraph}

 PIC



Aretes (edges)