Question 613738
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi, 
mathematically or on a sketch:  (5,-5) is out
5,-5
1,1)  D = sqrt(4^2 + -6^2)= sqrt(52)
5,-5
5,1  D = sqrt(0 + -6^2) = 6
{{{drawing(300,300,   -6, 6, -6, 6, grid(1),
circle(1, 1,0.3),
circle(5, 1,0.3),
circle(5, -5,0.3),
graph( 300, 300, -6, 6, -6, 6))}}}