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%@Auteur: Arnaud Gazagnes\par
\begin{center}
 {\psset{unit=1.75cm}
\begin{pspicture}(-0.25,-1.15)(2.5,0.55)
\rput(1.85,-0.6){$71^{\circ}$} \rput(0.6,-0.1){\textbf{?}}
\pstGeonode[PointSymbol=none,PosAngle={240,0,-30}](0,0){O}(2,-1){N}(2.19,0.44){S}
\pstLineAB{N}{S}
{\psset{unit=0.25cm}\pstSegmentMark[SegmentSymbol=MarkHash]{O}{S} \pstSegmentMark[SegmentSymbol=MarkHash]{O}{N}}
{\psset{unit=2.5cm}\pstMarkAngle[]{N}{O}{S}{}}
{\psset{unit=1.5cm}\pstMarkAngle[]{S}{N}{O}{}}
\end{pspicture}}
\kern0.05\linewidth
 {\psset{unit=3.75cm}
\begin{pspicture}(0.875,-0.625)(2,0.125)
\rput(1.35,-0.07){$30^{\circ}$} \rput(1.8,-0.3){\textbf{?}}
\pstGeonode[PointSymbol=none,PosAngle={240,0,-30}](1,0){E}(1.866,-0.5){T}(2,0){S}
\pstLineAB{T}{S}
{\psset{unit=0.25cm}\pstSegmentMark[SegmentSymbol=MarkHashh]{E}{S} \pstSegmentMark[SegmentSymbol=MarkHashh]{E}{T}}{\psset{unit=2.5cm}\pstMarkAngle[]{T}{E}{S}{}}
{\psset{unit=1.5cm}\pstMarkAngle[]{S}{T}{E}{}}
\end{pspicture}}
\end{center}
\`A l'aide de chacune des figures ci-dessus, calculer les mesures d'angles marqu\'es d'un \og \textbf{?} \fg.