In this paper, an area formula of polygon of inscribed or circumscribed ellipse is presented and the condition that the area reaches maximum value or minimum value is discussed.
提出了椭园内接或外切多边形面积公式，并讨论了其面积达到最大值与最小值的条件。
To enhance the precision of ellipse gyre surface, gives the scheme of the ellipse gyre surface with 2-axis NC machining before polishing and its formula of the minimum survature radius.
为了提高椭圆回转镜面的制造精确度，提出了抛光前二轴联动数控加工椭圆回转镜面方案；
To enhance the precision of ellipse gyre surface, gives the scheme of the ellipse gyre surface with 2-axis NC machining before polishing and its formula of the minimum survature radius.
为了提高椭圆回转镜面的制造精确度，提出了抛光前二轴联动数控加工椭圆回转镜面方案；
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