Proper form first.
X2 + Y2 = 1
Y2 = 1 - X2
Y = (+/-) sqrt(1 - X2)
--------------------------
zero out the X
Y = (+/-) sqrt(1 - 02)
Y = 1
----------------the radius of this circle
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That's the equation of a circle with its center at the origin and a radius of 8.
If that equals 16 then the radius is 4
X2 + y2 = 100 = r2 r = 10
x2 +y2 = R2 =16 = radius 2 R = 4
A Diophantine Equation. In order to solve it, you should use Euclide's algorithm.