%@Auteur: François Meria\par
\begin{multicols}{2}
À partir de la figure 1 ci-contre, on veut obtenir la figure 2
puis la figure 3, uniquement à l'aide de la symétrie axiale.
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            \put(2,0){Figure 1}
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\end{center}
\end{multicols}

\begin{enumerate}[(a)]
    \item Reproduire la figure 1 en prenant $OA=2$~cm et
    $OI=1$~cm.
    \item Quels sont les axes de symétrie de la figure 2 ?
    Compléter la figure 1 afin d'obtenir la figure 2.
    \item Décrire avec précision les axes de symétrie de la figure
    3. Compléter la figure 2 pour obtenir la figure 3.
    \item Colorier la figure 3 à l'aide de deux couleurs en
    alternant les couleurs.
    \item Combien d'axes de symétrie possède la figure 3 ? Et la
    figure coloriée ?
\end{enumerate}

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            \pstLineAB{A}{J}
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            \pstLineAB{O}{M}

            \pstOrtSym[PointSymbol=none,PosAngle=-45]{O}{M}{A}[B]
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            \pstOrtSym[PointSymbol=none,PointName=none]{A}{B}{I}[I1]
            \pstOrtSym[PointSymbol=none,PointName=none]{A}{B}{J}[J1]
            \pstOrtSym[PointSymbol=none,PointName=none]{A}{B}{K}[K1]
            \pstOrtSym[PointSymbol=none,PointName=none]{A}{B}{L}[L1]
            \pstOrtSym[PointSymbol=none,PointName=none]{A}{B}{M}[M1]
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            \pstLineAB{A}{I1}
            \pstLineAB{A}{J1}
            \pstLineAB{A}{K1}
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            \pstLineAB{B}{J1}
            \pstLineAB{B}{K1}
            \pstLineAB{B}{L1}
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        \put(2,-2){Figure 2}
        \endpspicture
\end{center}
%\begin{comment}
\begin{center}
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            \pstOrtSym[PointSymbol=none,PointName=none]{B}{C}{J2}[J3]
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            \pstLineAB{C}{J3}
            \pstLineAB{C}{K3}
            \pstLineAB{C}{L3}
            \pstLineAB{C}{M3}
            \pstLineAB{M2}{M3}
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        \put(3,-4){Figure 3}
        \endpspicture
\end{center}
{\em Attention à la précision des tracés\ldots}
%\end{comment}