 Hello and welcome to the session. In this session we will learn about collinear points, concurrent lines and line segments. First of all let us discuss collinear points. For this let us consider three points A, B and C. Now we have drawn a line L through the points A and B which is passing through the point C also. That means all these three points are lined on the same line as A, B and C lined on the same straight line B, C are collinear points. The line L is called the line of collinearity. Now here we will choose the position of any one of the three points. That is here we have changed the position of C. Now in this case also we are drawing a line through the points A, B. You can see that the point C is not lined on this line which is passing through the points A and B. The points A, B and C do not lie on the same straight line. So as A, B and C do not lie on the same line therefore A, B and C that are the points A, B and C non-collinear points. So from this we conclude that three or more points that lie on the same line collinear points and the line the line non-collinear points do not lie on the same straight line. Now let us learn about concurrent lines. For this let us consider N and N. Now there are various possibilities of their intersection and the third line N is also parallel to either of them. Then in this case the two line each other at this point which is O and the third line N does not pass through the point of intersection. Now in this case we can see that the lines L, M and N are intersecting at the same common point. That means all the three lines are passing through the common point. The lines L, M and N, current lines as they are passing through the same common point O and this point O is called the point of concurrency we conclude that three in a plane A and B on this line. Then the portion of the line from A to B is called the line segment A, B of the line segment A, B. A and B as its endpoints. Next we conclude that the line segment, now the distance between the points A and B is the length of the line segment A, B measure of the length A, B is denoted by A, B by putting a bar on it. Now here consider a line segment A, B of measure 10 cm. Now consider a point C on the line segment A, B is at a distance of 5 cm from A and B both. That means the length of line segment A, C is equal to length of line segment B, C. This means A, C and B, C are equal segments. So the point C divides the line segment A equal segments. C discuss what is the bisector of a line segment. Now here consider a line segment A, B and a line xy is dividing the line segment A, B into two equal segments. As shown by crossing them is equal to measure of A, B as these two are equal segments. Then the line xy at the bisect, the line segment A, B is called the bisector of the line segment. Now in the line segment you have learnt about the linear lines, concurrent lines and line segments. And this could be your session. Hope you all have enjoyed the session.