\begin{exercice}
  On considère une pyramide à base carrée $SABCD$ comme ci-dessous.
\begin{enumerate}
\item Reproduire la figure et placer les points $I$ et $J$ milieux respectifs des segments $[SD]$ et $[AB]$
\item Construire en justifiant la section de la pyramide par le plan $(CIJ)$.
\end{enumerate}

\begin{center}
  \begin{tikzpicture}[general,x=1.0cm,y=1.0cm,scale=.5]
%\clip(-1.8,-5.92) rectangle (5.48,0.82);
\draw [color=Noir] (1.,-5.)-- (-0.54,-3.);
\draw [color=Noir] (1.,-5.)-- (5.,-5.);
\draw [dashed,color=J1] (5.,-5.)-- (3.5,-3.);
\draw [dashed,color=J1] (3.5,-3.)-- (-0.54,-3.);
\draw [color=Noir] (-0.54,-3.)-- (2.02,0.6);
\draw [color=Noir] (2.02,0.6)-- (3.5,-3.);
\draw [color=Noir] (2.02,0.6)-- (5.,-5.);
\draw [color=Noir] (2.02,0.6)-- (1.,-5.);
\begin{scriptsize}
\draw [color=Noir] (1.,-5.)-- ++(-1.5pt,0 pt) -- ++(3.0pt,0 pt) ++(-1.5pt,-1.5pt) -- ++(0 pt,3.0pt);
\draw[color=Noir] (0.56,-5.06) node {$A$};
\draw [color=Noir] (5.,-5.)-- ++(-1.5pt,0 pt) -- ++(3.0pt,0 pt) ++(-1.5pt,-1.5pt) -- ++(0 pt,3.0pt);
\draw[color=Noir] (5.22,-5.02) node {$B$};
\draw [color=Noir] (3.5,-3.)-- ++(-1.5pt,0 pt) -- ++(3.0pt,0 pt) ++(-1.5pt,-1.5pt) -- ++(0 pt,3.0pt);
\draw[color=Noir] (3.,-2.64) node {$C$};
\draw [color=Noir] (-0.54,-3.)-- ++(-1.5pt,0 pt) -- ++(3.0pt,0 pt) ++(-1.5pt,-1.5pt) -- ++(0 pt,3.0pt);
\draw[color=Noir] (-0.68,-2.62) node {$D$};
\draw [color=Noir] (2.02,0.6)-- ++(-1.5pt,-1.5pt) -- ++(3.0pt,3.0pt) ++(-3.0pt,0) -- ++(3.0pt,-3.0pt);
\draw[color=Noir] (2.16,0.58) node [above] {$S$};
\end{scriptsize}
\end{tikzpicture}
\end{center}
\end{exercice}

