Question 1085761
I'll do one you do the others.
Find the center and radius.
For B, it's centered at (5,1) and the radius is 4.
Use the general form of a circle,
{{{(x-h)^2+(y-k)^2=R^2}}}
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B:{{{(x-5)^2+(y-1)^2=16}}}
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Do the others the same way.