-3.5 4.5 setxrange
-3.5 4.5 setyrange

12 setxunit

/A {-3 -3} def
/B {0.5 3.062} def
/C {4 -3} def

gsave
bleu
B C A 1 (-) tripointarcarrow
A B C 1 (-) tripointarcarrow
C A B 1 (-) tripointarcarrow
grestore


1.25 setcurvelinewidth
[A B C] polygone

rouge
[B A A C C B]{2 marked} dapply