证明线段成比例是“相似形”部分的重要内容,对于同学们来说也是一个难点.本文介绍这类问题的常用证法,供同学们参考.一、利用两个三角形相似得比例线段这是证线段成比例首先考虑的方法·观察要证比例式a/b=c/b,以a、b为 It is also a difficult point for the students to prove that the line segment is proportional to the “Similar Shape ” section.This article introduces the commonly used method of this kind of question, for the students to refer to.First, using two triangles similar proportion line segment This is the first line of the line in proportion to consider the method of observation to prove that the proportion of a / b = c / b, with a, b is