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本文揭示圆内接星形的一种非常奇特的属性．为此，先给出如下概念和引理：图１定义１从点Ｃ向有向线段ＡＢ引垂线（图１），交ＡＢ或其延长线于Ｄ．设有向线段ＣＤ的数量为ｄ，则ｄ称为点Ｃ到线段ＡＢ的有向距离．当点Ｃ位于ＡＢ所指方向的左侧时，ｄ＝｜ＣＤ｜＞０；当点...
This article reveals a very peculiar property of a circle inscribed star. To this end, first give the following concepts and lemmas: Figure 1 Definitions 1 from the point C to the directed line segment AB vertical line (Figure 1), AB or its extension line in D. The number of lines to the segment CD is d, then d is called the directed distance from point C to line AB. When point C is on the left of the direction of AB, d=|CD|>0; when the point...