\begin{exercice}[Sablier]
Sur le sablier ci-dessous, donner les positions relatives du plan $(ABC)$ et de la droite:

 \begin{colenumerate}{3}
  \item  $(AB)$;
  \item  $(SE)$;
  \item  $(EF)$.
 \end{colenumerate}
\vspace{-1em}
 \begin{center}
\begin{tikzpicture}[general, scale=0.65]
\draw[color=J4,fill=J4] (0,0)--(0,5)--(6,0)--(6,5)--cycle;
 \draw (0,0)--(3,2.5)--(0,5);
 \draw[ fill=J4] (0,0) .. controls +(-0.5,0) and +(-0.5,0)..(0,5);
 \draw[loosely dashed] (0,0) .. controls +(0.5,0) and +(0.5,0)..(0,5); 
 \draw[loosely dashed] (0,0)--(0,2.5);
 \draw[loosely dashed] (3,2.5)--(0,2.5);
 \draw (6,0)--(3,2.5)--(6,5);
 \draw[ fill=J4]  (6,0) .. controls +(0.5,0) and +(0.5,0)..(6,5);
 \draw[loosely dashed] (6,0) .. controls +(-0.5,0) and +(-0.5,0)..(6,5); 
 \draw[loosely dashed] (6,0)--(6,2.5);
 \draw[loosely dashed] (3,2.5)--(6,2.5);
  \draw (0,0) node[below] {$A$};
  \draw (0,2.5) node[above=-1pt] {$B$};
  \draw (-0.3,4) node[left] {$C$};
  \draw (-0.3,4) node {{\boldmath $+$}};
  \draw (3,2.5) node[above] {$S$};
  \draw (6,2.5) node[above=-1pt] {$E$};
  \draw (6,0) node[below] {$F$};
  \end{tikzpicture}
 \end{center}

\end{exercice}

