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浙教版(2006年7月版)数学八年级上册第51页有这样一个章节复习题:例1如图1所示的钢架中,∠A=20°,焊上等长的钢条来加固钢架.若P_1A=P_1P_2,问这样的钢条至多需要多少根?说明这是一个联系生活的实际问题,具有较强的综合性.尤其值得一提的是这个问题可以引起学生很浓厚的学习兴趣——大部分学生都非常喜欢这个题目,并能积极地进行思考和探索.因此,它完全够得上是等腰三角形性质这一知识点中的经典性问题.对这个题目比较普遍的分析方法如下:根据“在一
Zhejiang Education Edition (July 2006 edition) Mathematics eighth grade on the book page 51 there is such a chapter review questions: Example 1 In the steel frame shown in Figure 1, ∠A = 20 °, the welding of steel strips of the same length Reinforced steel frame. If P_1A = P_1P_2, ask such a steel strip how many roots? This shows that this is a real life-related issues, with a strong comprehensive. In particular, it is worth mentioning that this problem can cause students is very strong Interest in Learning - Most students are very fond of this topic and are able to think and explore actively, so it is well accepted as a classic issue in the knowledge of the isosceles triangle nature. Analytical methods are as follows: According to ”in one