Distance of Radical Plane from First Centre

Distance of Radical Plane from First Centre

For two spheres with radii $$R_1,R_2$$ and centre distance $$d$$, the distance $$x$$ of their radical plane from the first centre is:

$$x=\frac{d^2+R_1^2-R_2^2}{2d}$$

Usage

- Used to locate the radical plane along the line joining the two centres.

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