The algebraic sum of the product of any point on a closed curve and the distance from this point's normal line to a fix point is zero.
任意闭合曲线上的点与该点法线到某定点距离的乘积，其代数和为零。
The algebraic sum of the product of any point on a closed curve and the distance from this point's normal line to a fix point is zero.
任意闭合曲线上的点与该点法线到某定点距离的乘积，其代数和为零。
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