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对于同心圆的有关性质,教材中没作具体说明,但我们可以从例题、习题中总结得到.掌握它们,有助于提高解决问题的能力. 同心圆有以下几个性质:(1)在同心圆中,大圆的弦与小圆相交,异圆交点的距离相等(见人教版《几何》第三册P62例2.以下均指人教版《几何》第三册,不再注明).如图1,有AC=BD,AD=BC.(2)在同心
Regarding the nature of concentric circles, there is no specific description in the textbooks, but we can summarize them from examples and exercises. Grasping them will help improve the ability to solve problems. Concentric circles have the following properties: (1) in the same concentric In the circle, the major circle’s chord intersects with the small circle, and the distances between the different circular intersections are equal (see the PEP version “Geometry” Volume III P62 Example 2. The following are all referred to as the PEP “Geometry” Volume III, no longer specified) As shown in Figure 1, there is AC = BD, AD = BC. (2) in the concentric