Chapter 11 of class 6 line segment ray and line, a ray starts from a point and goes to infinity. A line has no endpoints. A line segment has two endpoints. A line segment connects both endpoints. Let A and B be two points on a plane. Then, the straight path from A to B is called the line segment AB. A line segment extended endlessly in one direction is called a ray. A line segment extended endlessly on both sides is called a line. Pen or pencil is an example of a line segment, Sun’s ray is an example of ray and two persons standing in a row is an example of line. Concepts which are discussed in this chapter are plane, point, line segment, ray, line, intersecting lines, parallel lines, concurrent lines, collinear points.