-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 $h$ 1.45 0.8 [1.8 dup] cltexlabel $\alpha$ 0.18 0.05 [1.8 dup] urtexlabel $\beta$ 4 -0.08 [1.8 dup] ultexlabel $\gamma$ 0.9 1.55 [1.8 dup] crtexlabel $a$ 2.98 0.9 [1.8 dup] uctexlabel $b$ 0.3 0.75 [1.8 dup] uctexlabel $c$ 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 $\rm{Abb}.\,10$ 2.2 -0.5 [2.0 dup] dctexlabel