autocrop
-10 8 setxrange
-5 7 setyrange
/A {0 0} def
/B {0 4.5} def
/C {-9 3 sqrt mul 2 div 0} def
[A B C] polygone
C A B angledroit
C B A 1.2 (-) tripointarc
setTimesItalic
(A) A drtext
(B) B urtext
(C) C dltext
setTimes
(60°) -120 B 1.2 cpoint dltext
<tex>
$$
{2\sqrt 3}
$$
</tex>
A B milieu [1.3 dup] crtexlabel
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