\begin{exercice}
 \label{2G3_E_1}
   \`A partir de la figure ci-dessous, citer un vecteur:
   \begin{enumerate}
    \item opposé à $\vv{CD}$;
    \item de même direction et de même sens que $\vv{AC}$;
    \item de même direction  que $\vv{BC}$ mais de sens contraire;
    \item égal au vecteur $\vv{BA}$.
   \end{enumerate}
   \begin{center}
   \begin{tikzpicture}[general]
\quadrillageSeyes{(0,0)}{(8,7.2)}

\pointGraphique{2.4}{3.2}{A}{left}
\pointGraphique{0.8}{0.8}{B}{below}
\pointGraphique{2.4}{0.8}{C}{left}
\pointGraphique{3.2}{1.6}{D}{below}
    \draw[epais, ->, color=C1] (0,2.4)--(0.8,2.4);
    \draw[color=C1] (0.4,2.4)  node[above] {{\boldmath $\vv u$}};
    \draw[epais, ->, color=C1] (0.8,4)--(2.4,6.4);
    \draw[color=C1] (1.6,5)  node[above left] {{\boldmath $\vv v$}};
    \draw[epais, ->, color=C1] (3.2,4)--(3.2,5.6);
    \draw[color=C1] (3.2,4.8)  node[left] {{\boldmath $\vv w$}};
    \draw[epais, ->, color=C1] (4,4.8)--(4.8,5.6);
    \draw[color=C1] (4.4,5.2)  node[above] {{\boldmath $\vv r$}};
    \draw[epais, ->, color=C1] (6.4,6.4)--(4.8,2.4);
    \draw[color=C1] (5.6,3.6)  node[above] {{\boldmath $\vv s$}};
    \draw[epais, ->, color=C1] (6.4,6.4)--(5.6,6.4);
    \draw[color=C1] (6,6.4)  node[above] {{\boldmath $\vv t$}};
    \draw[epais, ->, color=C1] (7.2,1.6)--(6.4,0.8);
    \draw[color=C1] (6.8,1.2)  node[above] {{\boldmath $\vv p$}};
    \draw[epais, ->, color=C1] (7.2,4)--(7.2,3.2);
    \draw[color=C1] (7.2,3.6)  node[left] {{\boldmath $\vv m$}};
   \end{tikzpicture}
   \end{center}
  \end{exercice}

