Equation of a sphere whose center is at (x0, y0, z0)
$$(x-x_0)^{2}+(y-y_0)^{2}+(z-z0)^{2} = R^{2}$$
R - radius of a sphere
(x0; y0; z0) - center of a sphere
(x0; y0; z0) - center of a sphere
Find
It is known that:
= 