Source
-0.7 5 setxrange
-1.2 3 setyrange
50 setxunit
50 setyunit

/A {0 0} def
/B {4 0} def
/C {1.5 2.5} def

[A B] (->) ligne
[A C] (->) ligne
[C B] (->) ligne



(A) A [1.5 dup] dltext
(B) B [1.5 dup] drtext
(C) C [1.5 dup] uctext


<latex>
$\rm{Abb}.\,5$
</latex>
2.6 -1.2 [2.0 dup] ultexlabel

<latex>
$\vec{a}$
</latex>
3.3 1.1 [1.8 dup] ultexlabel

<latex>
$\vec{b}$
</latex>
0.3 1.3 [1.8 dup] crtexlabel

<latex>
$\vec{c}=\vec{b}+\vec{a}$
</latex>
1.9 0.05 [1.8 dup] dctexlabel