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+\section {Angle droit}
+
+L'objet \Cadre{rightangle} permet de définir un angle droit. Sa
+syntaxe est
+\Cadre{[object=rightangle,args=$A$ $B$ $C$]}
+
+\begin{multicols}{2}
+
+%% projete orthpgonal d'un point sur une droite
+%%
+\begin{pspicture}(-3,-2.5)(3.5,2.5)%
+\psframe*[linecolor=blue!50](-3,-2.5)(3.5,2.5)
+\psset{lightsrc=viewpoint,viewpoint=50 30 15,Decran=40}
+\psset{solidmemory}
+%% definition du plan de projection
+\psSolid[object=plan,
+ definition=equation,
+ args={[1 0 1 0] 90},
+ base=-4 4 -3 3,
+ fillcolor=white,
+ linecolor=gray!30,
+% plangrid,
+ planmarks,
+ name=monplan,
+]
+\psset{plan=monplan,visibility=false}
+%% definition droite d
+\psProjection[object=droite,
+ definition=horizontale,
+ args=-1,
+ name=d,
+]
+\psset{fontsize=15}
+%% definition du point M
+\psProjection[object=point,
+ args=-2 1,
+ name=M,
+ text=M,
+ pos=ul,
+]
+%% definition du point H
+\psProjection[object=point,
+ definition=orthoproj,
+ args=M d,
+ name=H,
+ text=H,
+ pos=dr,
+]
+%% definition du point H' pour orienter l'angle droit
+%% et mettre la legende
+\psProjection[object=point,
+ definition=xdpoint,
+ args=2 d,
+ name=H',
+ action=none,
+ text=d,
+ pos=ur,
+]
+%% definition d'une ligne
+\psProjection[object=line,
+ args=M H,
+]
+%% dessin angle droit
+\psProjection[object=rightangle,
+ args=M H H',
+]
+\composeSolid
+%\axesIIID(4,4,2)(5,5,6)
+\end{pspicture}
+\columnbreak
+
+\begin{gbar}
+\begin{verbatim}
+\psProjection[object=droite,
+ definition=horizontale,args=-1,name=d,]
+\psProjection[object=point,args=-2 1,
+ name=M,text=M,pos=ul,]
+\psProjection[object=point,
+ definition=orthoproj,
+ args=M d,name=H,text=H,pos=dr,]
+%% definition du point H' pour orienter l'angle droit
+\psProjection[object=point,
+ definition=xdpoint,args=2 d,
+ name=H',action=none,text=d,pos=ur,]
+\psProjection[object=line,args=M H,]
+\psProjection[object=rightangle,args=M H H',]
+\end{verbatim}
+\end{gbar}
+
+\end{multicols}
+