%@metapost:6elmtsgeoexo99.mp Termine les rectangles ci-dessous. \begin{multicols}{3} Un rectangle $ABCD$. \[\includegraphics{6elmtsgeoexo99.4}\] \columnbreak\par Un rectangle $MNOP$. \[\includegraphics{6elmtsgeoexo99.5}\] \columnbreak\par Un rectangle $IJKL$. \[\includegraphics{6elmtsgeoexo99.6}\] \columnbreak\par \end{multicols}