0:00:02.067,0:00:05.800 Identify all the rays shown in the image below. 0:00:05.800,0:00:07.800 and this is a reminder what a ray is. 0:00:07.800,0:00:13.000 A ray start at some point and then goes on forever in some direction. 0:00:13.000,0:00:17.533 In order to find a ray you need that point that you're starting off on 0:00:17.533,0:00:19.800 so let's that point over there is called X 0:00:19.800,0:00:22.600 and then you need another point that sits on the ray 0:00:24.667,0:00:26.533 and the ray is just keep going beyond, we 0:00:26.533,0:00:35.533 will name that point as "Y" and we will call the ray "XY" 0:00:35.533,0:00:41.600 It starts in "X" and keeps going in the direction of "y" 0:00:41.600,0:00:45.533 for ever, it crosses "y" and keeps going further 0:00:45.533,0:00:50.667 we need the second point to specify the direction 0:00:50.667,0:00:56.200 in which the ray is going. 0:00:56.200,0:01:00.867 So, lets identify all the rays shown in the image 0:01:00.867,0:01:05.200 below, we can start anywhere, we will start at 0:01:05.200,0:01:13.800 point J, the only line segment we have starting from J 0:01:13.800,0:01:21.667 is JH going up, goes upto H and keeps on going 0:01:21.667,0:01:27.467 in that direction beyond H, ray JH, starting from J 0:01:27.467,0:01:31.267 going through H and going beyond it forever 0:01:31.267,0:01:37.800 now if we go to H, there is no ray HJ as the line ends 0:01:37.800,0:01:41.267 in J and does not keep going beyond J, there is no 0:01:41.267,0:01:47.333 ray H as it is just one point, just usiing one point, 0:01:47.333,0:01:51.600 we cannot say it as a ray. now looking at our diagram 0:01:51.600,0:02:08.067 the only ray is JH. Now let us look at the other points. 0:02:08.067,0:02:15.067 If we look at point C, once again there is no point 0:02:15.067,0:02:21.533 after C to specify it as a ray, we can have a ray CE, 0:02:21.533,0:02:27.600 starts at C goes through E and goes on for ever, 0:02:27.600,0:02:32.600 you can also have a ray starting at C, going through F 0:02:32.600,0:02:37.933 and going on forever, CE & CF are the same rays 0:02:37.933,0:02:49.133 as F sits on ray CE and E sits of ray CF, 0:02:49.133,0:03:02.933 so CE & CF are the same rays, 0:03:02.933,0:03:08.067 now lets think about what we can do from point E, 0:03:08.067,0:03:12.333 We can start at point E , go in the direction of C 0:03:12.333,0:03:17.600 and go beyond C, so it is a ray, ray EC 0:03:17.600,0:03:22.200 you could start in E and go in the direction of A and go 0:03:22.200,0:03:26.067 beyond A, so EA is a ray, and we can start at E and 0:03:26.067,0:03:30.200 go in the direction of F and go beyond F, that is ray EF 0:03:30.200,0:03:39.267 ray EF and ray CF are different as the 0:03:39.267,0:03:46.200 starting points are different 0:03:46.200,0:03:53.667 Now lets go to point F. To the left of point F 0:03:53.667,0:04:00.667 there is no other point. We can look at the right, 0:04:00.667,0:04:02.533 we can have ray FE, start at F go through E and 0:04:02.533,0:04:07.800 beyond E, you can have ray FC, start at F 0:04:07.800,0:04:17.667 go through C and beyond C that is teh same thing as FE 0:04:17.667,0:04:21.933 ray FE and ray FC are the same as the point E 0:04:21.933,0:04:33.200 is on ray FC, then finally we have not focussed on point A 0:04:33.200,0:04:39.133 you may think there is ray AE, but the line does not 0:04:39.133,0:04:44.800 go beyond E, so it is not a ray, to the top of A 0:04:44.800,0:04:48.000 there is no other point, so there is no ray there either 0:04:48.000,0:04:55.933 that is all the rays based on the points specified. 0:04:55.933,0:04:59.067 If they had given us a point over there, we could have 0:04:59.067,0:05:32.133 had other rays, 0:05:32.133,9:59:59.000 There are 6 rays in this problem