@options;

@figure;
  A = point( 6.07 , 0.8 );
  C = point( -5.61 , 0.24 );
  dAC = droite( A , C );
  O = milieu( A , C );
  perpOdAC = perpendiculaire( O , dAC );
  B = pointsur( perpOdAC , -5.39 );
  D = symetrique( B , O );
  sAB = segment( A , B );
  sCB = segment( C , B );
  sCD = segment( C , D );
  sDA = segment( D , A );

@analyse;
AB = 7.95
BC = 7.95
CD = 7.95
DA = 7.95