圆是平面几何中除三角形外又一类重要图形,笔者顺着这一思路,用开放题的形式,归纳复习圆的有关重要知识,尽量扩大覆盖面,得出一系列结论,仍颇有曲径通幽之妙.为此,我们再从已知圆两相交弦谈起.(另篇文章见2004年《中学数学杂志》初中第5期)已知圆两相交弦,其位置是不确定的.正 The circle is another important figure in addition to the triangle in the plane geometry. Following this idea, the author summarized the important knowledge of the circle in the form of open questions, expanded the coverage as far as possible, and obtained a series of conclusions. In order to do this, we will start from the known circle and the two intersecting strings. (The other article see the “secondary school junior high school mathematics magazine” in 2004, the fifth period) known round two-phase string, its position is uncertain .positive