%@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;
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);
drawarrow C--D; drawarrow B--A;
draw O--M withpen pencircle scaled 1.3bp;
label.urt(btex $\arg Z=\arg Z'$ etex,M);
label.rt(btex \fbox{$Z=Z'$ : similitude directe} etex, C);
fin;

end