input geometriesyr16; figure(0,0,7.5u,6.5u); pair O,A,B,C,D,E; trace grille(0.5) withcolor orange; O=pp(2,10); A-O=pp(-2,-4); B-O=pp(3,-6); C-O=pp(6,-3); D-C=O-A; E-C=pp(6,0); drawarrow O--A; trace appelation(A,O,2mm,btex $\overrightarrow{\strut a}$ etex); drawarrow O--B; trace appelation(O,1/2[A,C],2mm,btex $\overrightarrow{\strut e}$ etex); drawarrow O--C; trace appelation(O,C,2mm,btex $\overrightarrow{\strut c}$ etex); drawarrow E--C; trace appelation(C,E,2mm,btex $\overrightarrow{\strut g}$ etex); drawarrow E--B; trace appelation(B,E,-4mm,btex $\overrightarrow{\strut f}$ etex); drawarrow O--D; trace appelation(O,D,2mm,btex $\overrightarrow{\strut h}$ etex); fin; end