Hi

Standard Form of an Equation of a Circle is  

where Pt(h,k) is the center and r is the radius

1. (x+2)^2 + (y-3)^2 = 16  C(-2,3) r = 4

2. (x-8)^2 + (y-5)^2 =1    C(8,5)  r = 0





 

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