50 setxunit
7.5 setborder
90 setangle_repere
-3 3 setxrange
-3 3 setyrange
1 1 settkstep
1 1 setmkstep
ticks
marks
traceaxes
axesarrow
unites
/A {1.73 1} def
/B {1.73 -1} def
/O {0 0} def
/A' {0 2} def
/B' {-2.59 1.5} def
/C {-1.15 1} def
[A B A' B' C] points
[A B A' B'] dashpoints
(A) A drtext
(B) B drtext
(O) O drtext
(A') A' drtext
(B') B' drtext
(C) C drtext
C 1.52 cercle
O 2 cercle