Radius of a Sphere from General Equation

Rarely Tested

Radius of a Sphere from General Equation

For:

$$x^2+y^2+z^2+2gx+2fy+2hz+c=0$$

the radius is:

$$r=\sqrt{g^2+f^2+h^2-c}$$

Usage

- Used to obtain the radius directly from the general equation.

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