00:01
Helicopter flies on a bearing of 200 degrees from a to b.
00:04
So a to b and 200 degrees bearing means it's clockwise from retrospect to north.
00:09
So this is the north south and let's say from here we are calculating.
00:17
So 200 degrees clockwise is going to be remember that this complete angle is 180.
00:24
So 200 and this angle three quarter or three fourth of a of a circle is 200.
00:31
So definitely 200 is in between somewhere.
00:34
So 200 will be somewhere over here.
00:37
And this is where it is flying.
00:39
Helicopter is flying on a bearing of 200 degrees from a to b.
00:43
So it is flying like this from a to b.
00:49
And this particular angle is given as 200 degrees.
00:53
A, b is given as 70 kilometer.
00:55
I'm not writing the units for the moment.
00:58
And it flies then on a bearing of 150 degree from b to c now from b there is a bearing of 150 which means that it is less than 180 so definitely it's somewhere over here this is that there should be the angle so from b to c it flies like this and the bearing is as 150 it means that this particular angle is given as 150 degrees from b to c where c is south of a so clearly c is the south of a south of a south of a means clearly it is exactly below over here.
01:34
So straight vertical line is connecting a and c, in other words.
01:38
We have to find a distance of c from here, as an ac is the question mark over here, which you need to find.
01:45
Fair enough.
01:46
So first things first, let's find these angles.
01:50
Let's find this alpha.
01:52
And if this is alpha, by the way, then this is also alpha.
01:56
And why is that? because they are alternate angles.
01:58
So these are equal...