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Question

Define the following terms:
(i) Line segment (ii) Collinear points
(iii) Parallel lines (iv) Intersecting lines
(v) Concurrent lines (vi) Ray

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Solution

(i) Line segment: It is the part of a line whose both the ends are fixed(terminated).The given figure shows a line segment AB.

(ii) Collinear points: Three or more points lying on the same straight line are called collinear points. In the given figure, points A,B and C lie on the same straight line so these points are collinear.

(iii) Parallel lines: Two lines are said to be parallel to each other if they do not have common point, i.e. they do not intersect.

(iv) Intersecting lines: If two lines have a common point,the lines are said to be intersecting lines.In the given figure, line l and m have common point O, therefore these lines are intersecting lines.

(v) Concurrent lines: Three or more lines in a plane are said to be concurrent if all of them pass through the same point. In the given figure, four lines are passing through the same point O, therefore these lines are concurrent lines. The common point O is called the point of concurrency.

(vi) Ray: A straight line, generated by a point and moving in the same direction is called a ray. The given figure shows a ray AB.


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