数学思想是数学知识的灵魂,是解答数学问题的金钥匙.在求线段与角的问题时,根据问题的不同特点,考虑利用一定的数学思想,可化难为易.一、转化思想将要求的线段或角转化为其他相关线段或角的和或差等.通过求出相关的线段或角,从而求出要求的线段或角.例1如图1,AB=20,C为线段AB的中 Mathematical thinking is the soul of mathematical knowledge, is the golden key to answer mathematical problems in the line of the problem and the angle, according to the different characteristics of the problem, consider the use of a certain mathematical thinking, can be difficult for easy .A conversion thought will require Line segment or angle into other related segments or the sum of angles or differences, etc. By finding the relevant line segment or angle, thereby obtaining the required line segment or angle Example 1 As shown in Figure 1, AB = 20, C is the line AB