-1.5 6.5 setxrange
-1.5 4.5 setyrange
/a 3 def
/A {0 a} def
/B {a a} def
/C {a 0} def
/D {0 0} def
/I {C D 60 rotatepoint} def
/J {C B 60 rotatepoint} def
[A B C D I J] points
[A B C D] polygone
[D I C J B] ligne
[
A B
B C
C D
D A
D I
I C
B J
J C
] {1 marked} dapply
bleu
D A B angledroit
setTimesItalic
(A) A ultext
(B) B urtext
(C) C drtext
(D) D dltext
(I) I rtext
(J) J rtext
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