00:01
Now in this question, this is the situation which is given to us.
00:05
There is a line p, there is a line q, there is a line l, there is a line n.
00:14
This is the line n.
00:19
This is the line m.
00:21
So this information is given to us and we are also given these angles are 90 degree.
00:27
This information is given to us and also we are given this angle and this angle to this to be 120 degree.
00:35
Now, we need to tell how many lines are parallel, basically.
00:39
We need to give the pair of lines which are parallel to each other.
00:42
This is the primary requirement in the question.
00:45
So first of all, i want to choose the line p and line q.
00:50
So if you take line p and line q, this is line p and this is line q.
00:57
Now choose a line m also.
01:01
So if you choose line m, you will see this information is given to us.
01:05
This is 120 degrees and this is how much? 120 degrees.
01:11
So if you see this angle and this angle, we call these angles as interior alternate angles.
01:21
These are interior alternate angles.
01:27
Interior alternate angles.
01:35
So what is happening in our case? interior alternate angles are equal.
01:41
And we know this happens only when the line p and q are parallel hence line p and line q are parallel okay are basically parallel to each other okay so this is the first thing that we have done now we need to see the other pair of lines which can be parallel to each other so which is the next line a group of line that we can pick from here.
02:17
So we can pick the group of line y and line l.
02:24
So let us see that also.
02:27
Now, since we have already proved that line p and line q are parallel, we have proved this.
02:38
Okay, now there is a line which is passing through this.
02:41
We are calling this line as n.
02:43
This is this line...