Define the following terms.
(i) Line segment
(ii) Collinear points
(iii) Parallel lines
(iv) Intersecting lines
(v) Concurrent lines
Give two points A and B on a line I. the connected part (segment) of the line with end points at A and B is called the line segment AB.
(ii) Collinear points:
Three or more points are said to be collinear if there is a line which contains all of them.
(iii) Parallel lines:
Two lines l and m in a plane are said to be parallel lines if they do not intersect each other.
(iv) Intersecting lines:
Two lines are intersecting if they have a common point. The common point is called point of intersection.
(v) Concurrent lines:
Three or more lines are said to be concurrent if there is a point which lies on all of them.
A line in which one end point is fixed and the other part can be extended endlessly.
If A, B. C be the points on a line l, such that A lies between B and C, and we delete the point A from line l, the two parts of l that remain are each called half-line.