Which explains how to find the radius of a circle whose equation is in the form x2 y2 = z?

If the expression is x^2 + y^2 = z, means that the radius is √z.

That is because the general expression of a circle with the center at the origin of the coordinate system is x^2 + y^2 = (radius)^2

Then in  your expression z = (radius)^2, and the radius is found by taking square root>

√(radius)^2  =  √z

=>radius = √z

The radius is the square root of the constant term, z.

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