-0.8 5 setxrange
-1 2.5 setyrange
50 setxunit
50 setyunit

/A {0 0} def
/B {4.5 0} def
/C {1 2} def
%/F {2.838 0} def
%/G {2.838 1.622} def
%/H {1.216 1.622} def
/H {C A B orthoproj} def

[A B C] polygone
A C B 0.3 (-) tripointarcarrow
B A C 0.3 (-) tripointarcarrow
C B A 0.5 (-) tripointarcarrow

[C H] ligne
<latex>
$h$
</latex>
1.45 0.8 [1.8 dup] cltexlabel

<latex>
$\alpha$
</latex>
0.18 0.05 [1.8 dup] urtexlabel

<latex>
$\beta$
</latex>
4 -0.08 [1.8 dup] ultexlabel

<latex>
$\gamma$
</latex>
0.9 1.55 [1.8 dup] crtexlabel

<latex>
$a$
</latex>
2.98 0.9 [1.8 dup] uctexlabel

<latex>
$b$
</latex>
0.3 0.75 [1.8 dup] uctexlabel

<latex>
$c$
</latex>
2.2 0 [1.8 dup] dctexlabel

(A) A [1.5 dup] dltext
(B) B [1.5 dup] drtext
(C) C [1.5 dup] uctext
(C') 1 0 [1.5 dup] dctext
<latex>
$\rm{Abb}.\,13$
</latex>
2.2 -0.5 [2.0 dup] dctexlabel