@options;

@figure;
  A = point( -1.88 , -0.77 )  { rond2 , (-0.6,0.1) };
  B = point( 2.3 , -0.23 )  { rond2 , (0.23,-0.2) };
  sAB = segment( A , B );
  C = point( 0.72 , 2.37 )  { rond2 , (-0.43,-0.9) };
  sAC = segment( A , C );
  sCB = segment( C , B );
  ca1 = carre4(B,A,E2,E1);
  O1 =centrecarre(B,A,E2,E1);
  ca2 =carre4(C,B,E3,E4);
  O2 =centrecarre(C,B,E3,E4);
  ca3 =carre4(A,C,E5,E6);
  O3 =centrecarre(A,C,E5,E6);
  sCO1 = droite( C , O1 )  { rougefonce , 2 , car-2 , italique };
  sO3B = droite( O3 , B )  { rougefonce , 2 , car-3 , italique };
  sAO2 = droite( A , O2 )  { rougefonce , 2 , car-2 , italique };