sqrt(8) = 2*sqrt(2) = 2.83
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x2 + y2 = 2
If that means = 36 then then the radius of the circle is 6 units
It is x2 + y2 = 4
x2 + y2 = r2, where r is the radius.
I think you have missed out an equals sign. If you mean x2 + y2 = 16, then the radius is 4.