Calculation: PHsIoD - 1

(x-x0)^²+ (y-y0)^²+ (z-z0)^² =
R^²

(x-x0)^²+ (y-y0)^²+ (z-z0)^² = R^² $(x-x0)^{2}+(y-y0)^{2}+(z-z0)^{2}$ = $R^{2}$

(x-x0)^² = R^²- (y-y0)^²- (z-z0)^² $(x-x0)^{2}$ = $R^{2}-(y-y0)^{2}-(z-z0)^{2}$

(x-x0)^² = R^²- y^²+ 2* y* y0- y0^²- z^²+ 2* z* z0- z0^² $(x-x0)^{2}$ = $R^{2}-y^{2}+2\cdot y\cdot y0-y0^{2}-z^{2}+2\cdot z\cdot z0-z0^{2}$

x = saknis(

R^²- y^²+ 2* y* y0- y0^²- z^²+ 2* z* z0- z0^²)+x0 $x$ = $\sqrt {R^{2}-y^{2}+2\cdot y\cdot y0-y0^{2}-z^{2}+2\cdot z\cdot z0-z0^{2}}+x0$