%@Auteur: Arnaud Gazagnes\par {\psset{unit=1cm} \begin{pspicture}(-0.15,-0.5)(3.15,2.5) \psarc(0,0){0.75}{0}{42} \psarc(3,0){0.75}{112}{180} \rput(1.1,0.35){42$^\circ$} \rput(2.1,0.5){68$^\circ$} \pnode(3,0){B} \pnode(0,0){A} \pnode(2.2,1.98){C} \pslineByHand(A)(B)(C)(A) \pcline[offset=-9pt]{<->}(0,0)(3,0) \mput*{5} \end{pspicture}} \hfill {\psset{unit=.75cm} \begin{pspicture}(-2.6,-0.5)(4.15,2) \psarc(0,0){0.4}{0}{145} \rput(0.3,0.65){145$^\circ$} \pnode(4,0){B} \pnode(0,0){A} \pnode(-2.46,1.72){C} \pslineByHand(A)(B)(C)(A) \pcline[offset=-9pt]{<->}(0,0)(4,0) \mput*{6} \pcline[offset=9pt]{<->}(0,0)(-2.46,1.72) \mput*{4,5} \end{pspicture}} \par Reproduis en vraie grandeur les deux triangles dessin\'es \`a main lev\'ee. {\em On utilisera une feuille non quadrillée.}