-3.5 4.5 setxrange -3.5 4.5 setyrange 12 setxunit /A {-3 -3} def /B {-3 3} def /C {3.5 -3} def gsave bleu B C A 1 (-) tripointarc A B C .75 (=) tripointarc C A B angledroit grestore 1.25 setcurvelinewidth [A B C] polygone