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+\section{Right angle}
+
+\subsection{Direct definition}
+
+The object \texttt{rightangle} allows us to specify and draw a
+right angle. The syntax is: \texttt{[object=rightangle,args=$A$
+$B$ $C$]}
+
+\begin{LTXexample}[width=7.5cm]
+\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}
+\end{LTXexample}
+
+\endinput