200 setwidth
-8 8 setxrange
-8 8 setyrange
/quadrillagegray .2 def
quadrillage
/A {-4 -2} def
/B {0 4} def
/C {4 -2} def
A
B C vecteur
-.5 mulv
addv
/M defpoint
1.3 setlinewidth
[A B C] polygone
M times2
setTimesItalic
(A) A dltext
(B) B ultext
(C) C drtext
(M) M urtext
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