%@AUTEUR:Guillaume Connan

prologues:=2;

verbatimtex
%&latex
\documentclass{article}
\usepackage[upright]{fourier}
\begin{document}
etex

input geometriesyr16

figure(-3u,-3u,5u,3u);
path cc;
cc=cercle(origin,2cm); trace cc dashed evenly;

pair O,A,B,C,D,M,M';
O=origin;A=u*(2.3,0);B=symetrie(A,O);C=rotation(A,O,-90);D=rotation(A,O,90);M=pointarc(cc,40);
M'=symetrie(M,O,A);
drawarrow C--D; drawarrow B--A;
draw O--M withpen pencircle scaled 1.3bp;draw O--M' withcolor orange withpen pencircle scaled 1.3bp;
label.rt(btex $\arg Z'=-\arg Z$ etex,M') withcolor orange;
label.rt(btex \fbox{$Z'=\bar{Z}$ : similitude indirecte}  etex, C);

fin;

end