@options;
@figure;
  A = point(0,2)  {vert,(-0.75,-0.35)};
  B = point(-2,-1)  {jaune};
  AB =droite(A,B)  {rouge,3};
  C = point(2,0);
  s2 =segment(A,C);
  m =mediatrice(s2)  {o};
  p =polygone(A,B,C)  {blanc,plein30};