We discuss Milne’s inequality and apply it to the sides of a convex quadrilateral to derive an approximation to the area of the quadrilateral via arithmetic and harmonic means of pairs of opposite sides.

中文翻译：

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均值、米尔恩不等式和四边形面积

我们讨论 Milne 不等式并将其应用于凸四边形的边，以通过对边对的算术和调和平均值推导出四边形面积的近似值。