%@AUTEUR:Guillaume Connan prologues:=2; verbatimtex %&latex \documentclass{article} \usepackage[upright]{fourier} \begin{document} etex input geometriesyr16 figure(-1.5u,-3.5u,10u,3u) pair C,E,M,M'; marque_p:="non"; C=origin; E=u*(2,0); M=u*(4,1); M'=rotation(M,C,30); drawarrow C--E; drawarrow C--M withpen pencircle scaled 1.3bp; drawarrow C--M' withpen pencircle scaled 1.3bp withcolor orange; trace arccercle(M,M',C) dashed evenly withcolor orange; marque_a:=30; trace Codeangle(E,C,M,1,btex $\theta$ etex); marque_a:=20; trace Codeangle(M,C,M',2,btex $\alpha$ etex) withcolor orange; nomme.rt(M); nomme.rt(M'); nomme.lft(C); label.bot(btex $\overrightarrow{e_1}$ etex, 0.5E); fin; end