verbatimtex
%&latex
\documentclass{article}
\usepackage[frenchb]{babel}
\begin{document}
etex

input geometriesyr16;

figuremainlevee(0,0,8u,6u);
pair A,B,C;
A=u*(0.75,0.75);
B=u*(7.25,0.75);
C=demidroite(B,rotation(A,B,-60)) intersectionpoint%
demidroite(A,rotation(B,A,50));
trace polygone(A,B,C);
trace Marqueangle(demidroite(B,C),demidroite(B,A),0);
label.lft(btex 60\degres etex,w);
trace Marqueangle(demidroite(A,B),demidroite(A,C),0);
label.rt(btex 50\degres etex,w);
trace appelation(A,B,-2mm,btex 7~cm etex);
nomme.llft(A);
nomme.lrt(B);
nomme.top(C);
finmainlevee;

end