Расчет: YkCiRX - 1

(x-x0)^²+ (y-y0)^² =
R^²

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

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

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

x = saknis(

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