Question 860229
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Hi,
(2,3) and 
(-6,-5)  C(-2, -1)        Midpoint Pt(x,y):  ( {{{(x[1] + x[2])/2}}}, {{{(y[1] + y[2])/2  )}}})
D = {{{sqrt ((x[1]-x[2])^2+(y[1]-y[2])^2))}}}
r ={{{ (1/2)sqrt(8^2 + 8^2)}}} = 11.3/2 = 5.65
{{{(x+2)^2 + (y + 1)^2 = 5.65^2}}}