Projecting the line y=x onto the Riemann Sphere

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I am trying to project the line "y=x" on the complex plane including the point at infinity to the Riemann Sphere. I know the projection is a circle, but I want to understand how to find the radius of the circle on the sphere. Any hints are appreciated. Thank you!

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Why do you need an algebraic proof? The following figure depicts intuitively that the image of the line on the sphere is a great circle: enter image description here

(The lines from the North pole to the line $y=x$ form a plane perpendicular to the $x$ plane.)