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1问题的提出圆是初中几何的最后一个章节,可以说是初中数学知识的巅峰。无论是从知识的学习、技能的训练或数学思想方法的渗透,都为我们提供了一些新鲜的思考。在此之前,对于等腰三角形、直角三角形问题的解决往往陷入繁杂的计算,但是如果能运用圆的相关知识,就能从全新的视角来看待和解决问题。利用几何问题中某些元素关系的不变性,构造辅助圆,有利于相关几何问题的解决。2构造圆解决几何问题的几个案例
1 The question of the proposed circle is the last chapter of junior high school geometry, arguably the pinnacle of junior high school mathematics. Whether it is from the knowledge of learning, skills training or mathematical ideas and methods of infiltration, we have provided some fresh thinking. Prior to this, for the isosceles triangle, the solution to the right triangle problem often fall into the complicated calculation, but if you can use the circle of related knowledge, you can from a new perspective and solve the problem. Utilizing the invariance of the relationship of some elements in the geometric problem, the auxiliary circle is constructed, which is good for the solution of related geometric problems. 2 Construct circles to solve a few cases of geometry problems