Following this link: http://mathworld.wolfram.com/Circle-CircleIntersection.html
I now understand how to calculate the offset of the radical line from circle_a (a)
Let two circles of radii and and centered at and intersect in a region shaped like an asymmetric lens. The equations of the two circles are x^2 + y^2 = R^2 (x-d)^2 + y^2 = R^2
So this methods assumes that the y coordinates of both circles are the same?
How do I calculate the intersection points where both the x and y coordinates are not the same then?