%@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