Radius of center (0,3) = 1
Let the center of C be (x, y) and the radius be | y |.
Under the root symbol [x? +(y-3)? ]= 1+|y|
x? -6y+9= 1+2|y|
If y>0 is x? -6y+9= 1+2y 8y=x? +8
If y < 0 is x? -6y+9= 1-2y 4y=x? +4