Question 671346
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
x^2+Y^2-x+10y+25=0
x^2+Y^2-x+10y= -25
 (x-1/2)^2 + (y+5)^2 = -25 + 1/4 + 25
{{{ (x-1/2)^2 + (y+5)^2 = 1/4 = (1/2)^2}}}  C(.5,-5), r = 1/2