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由解析几何可知,在直角坐标系中,一个圆的方程可用下式来表达: (x-a)~2+(y-b)~2=R~2 式中,a、b为圆心的坐标值;R为圆半径,
From the analytic geometry we can see that in the Cartesian coordinate system, a circle equation can be expressed as follows: (xa) ~ 2 + (yb) ~ 2 = R ~ 2 where a and b are the coordinates of the center of the circle; R is Circle radius,