@options;

@figure;
  A = point( -5.5 , 0.63 )  { noir };
  B = point( 5.63 , -0.5 )  { noir };
  sAB = segment( A , B )  { grisfonce , 7 };
  O = milieu( sAB )  { noir };
  var r =OA { 5.59460559874917 };
  ceOA = cercle( O , A )  { grisfonce , 7 };
  C = pointaimante( 2.53 , 5.93 , CO=r_30% );