直线、射线、线段都是几何中最简单、最基本的图形，它们之间既有区别又有联系．初学几何的同学往往对它们的异同点搞不清楚，直接影响几何入门乃至以后的学习．为解决这个问题，本文特对它们的联系与区别作归纳和总结，供同学们学习时参考．一、联系1．直线、射线、线段给我们 Lines, rays, and line segments are the simplest and most basic graphics in geometry. There are differences and connections between them. Beginner geometry students often do not understand their similarities and differences, directly affecting the geometry of learning and even after learning. In order to solve this problem, this article specializes in summing up and summarizing the connection and difference between them, for reference when the students learn. First, contact 1. Lines, rays, lines to us