autocrop
-2 5 setxrange
-2 5 setyrange
/A {0 0} def
/C {4.2 0} def
A 2.8 C 3.9 intercercle /B defpoint popp
/I {A B milieu} def
%% l'angle ACB
180 C B angle sub /alpha exch def
%% la droite (ID)
I dupp alpha dir
A C interdroite
/D defpoint
[I D] ligne
A I D .5 (-) tripointarc
B C A .5 (-) tripointarc
A I 1 marked
I B 1 marked
1.5 setlinewidth
[A B C] polygone
setTimesItalic
(A) A dltext
(B) B urtext
(C) C drtext
(D) D drtext
(I) I ultext
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