% Patron d'un tetraedre % 1. Definition des points caracteristiques de la geometrie \figinit{4cm} % Sommets \figpt 1:$A$(0,0) \figpt 2:$B$(0.5,-1) \figpt 3:$C$(1.3,-0.4) \def\RadA{1.2}\def\RadB{0.9}\def\RadC{1} \figptsintercirc 11 [2,\RadB ; 3,\RadC] \figptsintercirc 12 [3,\RadC ; 1,\RadA] \figptsintercirc 13 [1,\RadA ; 2,\RadB] \figptorthoprojline 21:$\alpha$=11/2,3/ \figptorthoprojline 22:$\beta$=12/1,3/ \figptorthoprojline 23:$\gamma$=13/1,2/ \figvectN 51[2,3]\figvectN 52[1,3] \figptinterlines 4:$E$[11,51; 12,52] % 2. Creation du fichier graphique \figdrawbegin{} \figdrawline[1,2,3,1] \figdrawline[1,13,2,11,3,12,1] \figdrawline[11,4]\figdrawline[12,4]\figdrawline[13,4] \def\DIM{0.05} \figdrawaltitude \DIM[4,2,3]\figdrawaltitude \DIM[4,1,3]\figdrawaltitude \DIM[4,2,1] \figdrawend % 3. Inscription du texte sur le dessin \def\dist{2pt}\def\Dist{4pt} \figvisu{\figBoxA}{\it Patron d'un t\'etra\`edre \rm(p. 132)}{% \figwritenw 1:(\dist)\figwrites 2:(\dist)\figwritene 3:(\dist) \figwritee 11:$P$(\dist)\figwriten 12:$Q$(\dist)\figwritew 13:$R$(\dist) \figwritene 4:(\dist) \figwritee 21:(\Dist)\figwritegw 22:(0,\Dist)\figwritegw 23:(4pt,0.1pt) \figset write(mark=$\times$) \figptbary 41:[13,2;1,1]\figptbary 42:[11,2;1,1]\figwritep[41,42] \figset write(mark=$\figCirc$) \figptbary 41:[11,3;1,1]\figptbary 42:[12,3;1,1]\figwritep[41,42] \figset write(mark=$\star$) \figptbary 41:[12,1;1,1]\figptbary 42:[13,1;1,1]\figwritep[41,42] } \centerline{\box\figBoxA}