论文部分内容阅读
三角形中的线段关系问题,是初中几何中最常见的问题,这类问题往往可以用面积法解决,因为三角形的面积总是与其中的线段直接相关的.例1如图1,已知等腰ABC中,BD、CE为两腰上的高,求证:BD=CE.分析等腰三角形的两腰相等,而同一个三角形的面积可以通过两腰上不同的高来分别表示,于是
The problem of line segment relations in triangles is the most common problem in junior high school geometry. Such problems can often be solved by the area method because the area of the triangle is always directly related to the line segment. Example 1 is shown in Fig. 1, and isosceles is known. In ABC, BD and CE are high on both sides. Proof: BD=CE. Analyze the isosceles triangle with equal waist, and the area of the same triangle can be expressed by the different heights of the two waists.