@options;
  repereortho(220,220,30,1,1){ 0 , moyen , noir , num1 };

@figure;
  A = point( 1.5 , 1.5 );
  cerayA4 = cerclerayon( A , 4 );
  varsi z =[abscisse(A)>=0,1,0] { 1 };
  M = µ(z) pointaimante( -3 , 3.5 , AM=4_50% );