+-----------------------------------------------------------------+
  |                                                                 |
  |                                                                 |
A x                                                                 |
  |  x                                                              |
  |     x                                                           |
  |        x                                                        |
  |           x                                                     o C
  |              x                                               o  |
  |                 x                                         o     |
  |                    x                                   o        |
  |                       x                             o           |
  |                          x                       o              |
  |                             x                 o                 |
  |                                x           o                    |
  |                                   x     o                       |
Y .......................................* P                        |
  |                                   o  .  x                       |
  |                                o     .     x                    |
  |                             o        .        x                 |
  |                          o           .           x              |
  |                       o              .              x           |
  |                    o                 .                 x        |
  |                 o                    .                    x     |
  |              o                       .                       x  |
  |           o                          .                          x D
  |        o                             .                          |
  |     o                                .                          |
  |  o                                   .                          |
B o                                      .                          |
  |                                      .                          |
  |                                      .                          |
  +--------------------------------------.--------------------------+
                                         X
sub solve{
	my( $a, $b, $c, $d ) = @_;
	my( $x, $y );

	# Some trig :)
	
	return( $x, $y );
}