%@Auteur: François Meria\par
Dans chacun des cas suivants, faire une figure en vraies grandeurs
 et calculer l'aire du parallélogramme donné.
\begin{multicols}{3}
\begin{center}
\psset{unit=0.75cm}
\pspicture(-0.5,-0.5)(5,4) %\psgrid
\pstGeonode[PointSymbol=none,PosAngle={180,0,180}](0,0){A}(3.5,0){B}(1,3.5){D}
\pstGeonode[PointSymbol=none,PointName=none](2,3.5){H}
\pstLineAB{A}{B} \pstLineAB{A}{D}
\pstTranslation[PointSymbol=none,PosAngle=0]{A}{B}{D}{C}
\pstLineAB{B}{C} \pstLineAB{C}{D}
\pstProjection[PointSymbol=none,PointName=none]{A}{B}{H}{K}
\pstLineAB[linestyle=dashed]{K}{H} \pstRightAngle{C}{H}{K}
\pstRightAngle{B}{K}{H} \put(2.4,1.75){3,5~cm}
\pcline{<->}(0,-0.5)(3.5,-0.5) \lput*{:U}{6~cm}
\endpspicture
\end{center}

\begin{center}
\psset{unit=0.75cm}
\pspicture(-0.5,-0.5)(5,4) %\psgrid
\pstGeonode[PointSymbol=none,PosAngle={180,0,180}](0,0){S}(4,0){N}(1,3.5){F}
\pstGeonode[PointSymbol=none,PointName=none](2,3.5){H}
\pstLineAB{S}{N} \pstLineAB{S}{F}
\pstTranslation[PointSymbol=none,PosAngle=0]{S}{N}{F}{C}
\pstLineAB{N}{C} \pstLineAB{C}{F}
\pstProjection[PointSymbol=none,PointName=none]{S}{N}{H}{K}
\pstLineAB[linestyle=dashed]{K}{H} \pstRightAngle{C}{H}{K}
\pstRightAngle{N}{K}{H} \put(2.4,1.75){4~cm}
\pcline{<->}(0,-0.5)(4,-0.5) \lput*{:U}{7~cm}
\endpspicture

\end{center}

\begin{center}
\psset{unit=0.75cm}
\pspicture(-0.5,-0.5)(5,4) %\psgrid
\pstGeonode[PointSymbol=none,PosAngle={180,0,180}](0,0){J}(3.5,0){E}(1,2.5){N}
\pstGeonode[PointSymbol=none,PointName=none](2,2.5){H}
\pstLineAB{J}{E} \pstLineAB{J}{N}
\pstTranslation[PointSymbol=none,PosAngle=0]{J}{E}{N}{A}
\pstLineAB{E}{A} \pstLineAB{A}{N}
\pstProjection[PointSymbol=none,PointName=none]{J}{E}{H}{K}
\pstLineAB[linestyle=dashed]{K}{H} \pstRightAngle{A}{H}{K}
\pstRightAngle{E}{K}{H} \put(2.4,1.25){2~cm}
\pcline{<->}(0,-0.5)(3.5,-0.5) \lput*{:U}{4,5~cm}
\endpspicture
\end{center}
\end{multicols}