\begin{exercice}
Reproduire chaque figure et les compléter pour obtenir la représentation en perspective cavalière d'un cube. \vspace{0.5em}

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\begin{tikzpicture}[general, scale=0.75]
 \draw[quadrillage] (0,0) grid (5,4); 
 \draw (0.5,3.5) node[color=C1, circle, draw] {\bfseries a};
\draw (1,1)--(4,1)--(4,4);
\draw (5,2)--(4,1);
\end{tikzpicture}
\hfill
\begin{tikzpicture}[general, scale=0.75]
 \draw[quadrillage] (0,1) grid (5,5); 
 \draw (0.5,4.5) node[color=C1, circle, draw] {\bfseries b};
\draw[ dashed] (0,1)--(2,2)--(2,5);
\draw[ dashed] (5,2)--(2,2);
\end{tikzpicture}

\begin{tikzpicture}[general, scale=0.75]
\draw[quadrillage] (0,0) grid (5,4); 
 \draw (0.5,3.5) node[color=C1, circle, draw] {\bfseries c};
\draw (2,0)--(2,3);
\draw (0,3)--(2,0)--(5,0);
\end{tikzpicture}
\hfill
\begin{tikzpicture}[general, scale=0.75]
 \draw[quadrillage] (0,0) grid (5,4); 
 \draw (0.5,3.5) node[color=C1, circle, draw] {\bfseries d};
\draw (1,1)--(3,0)--(5,1);
\draw (3,0)--(3,3);
\end{tikzpicture}
\end{exercice}
