Question 851774
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Hi,
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
circle with center at (3,-1) and radius is 4
{{{(x-3)^2 + (y+1)^2 = 4^2}}}