Question 841076
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Hi,
Assume You mean:
a circle has the equation
 x^2 + y^2=121    C(0,0)   r  = 11
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