There is no test case r < 1.
For example, checkio("(1,2),(1,1),(2,1)") = '(x-1.5)^2+(y-1.5)^2=0.71^2'.
Of course, correct answer is not '(x-1.5)^2+(y-1.5)^2=0.707^2'.
The '{.3g}' trick does not work.
Or it is easy to change condition to 1 <= r < 10.
Created at: 2014/03/13 10:00; Updated at: 2014/03/14 02:15