问题:下图中一共有几条线段?思路点睛:要想正确数出图中一共有几条线段,关键是按顺序有规律地去数,做到不重复、不遗漏。为此我们可以按基本线段数,或者以线段的一个端点为起点按顺序来数。方法 :按基本线段数。就是把两点之间的线段看作是基本线段,比如上图中的AB、BC、CD、DE就是基本线段,而AC就是由两条基本线段组成的线段,AE是由4条基本 Question: There are a total of a few lines in the picture below? Ideas dotting: In order to correctly figure out a total of a few lines, the key is to go regularly according to the order of numbers, so do not repeat, do not miss. For this we can press the number of basic line segments, or an endpoint of the line as a starting point in order to count. Method: According to the basic line segments. Is the line between the two points as a basic line, such as the above figure AB, BC, CD, DE is the basic line, and AC is composed of two basic line segments, AE is composed of four basic