function value = quadrilateral_unit_area ( )

%*****************************************************************************80
%
%% quadrilateral_unit_area() returns the area of a unit quadrilateral.
%
%  Discussion:
%
%    The unit quadrilateral has vertices (0,0), (1,0), (1,1), (0,1).
%
%  Licensing:
%
%    This code is distributed under the MIT license. 
%
%  Modified:
%
%    29 April 2023
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    real value: the area.
%
  value = 1.0;

  return
end
