Question 1179518
Standard Form of an Equation of a Circle is {{{(x-h)^2 + (y-k)^2 = r^2}}} 
where Pt(h,k) is the center and r is the radius
8x2 + 8y2 = 64
0r
x^2 + y^2 = 8
{{{(x)^2 + (y)^2 = 8}}} 
C(0,0) and r =√8 =   2√2