% Doughnut problem.
% 
%	100 = x^2 + y^2 +/- 0.1

:- consult(order)?

f(10.0,0.001).
f(1.0,10.0).
f(9.0,4.359).
f(8.0,6.0).

:- f(1.0,8.5).
:- f(3.0,1.1).
:- f(7.0,7.0).
:- f(13.0,0.077).