00:01
In this question, we're going to be describing each angle as it relates to the diagrams given below.
00:08
So for the first diagram, there's a person standing at a high point and the second person in a boat.
00:17
Then there's a person who seems to be swimming at the bottom.
00:21
So angle one is the angle of depression of person, let me call these people, a, b, b, so angle 1 is the angle of depression from person a to person b.
00:44
Angle b, angle 2 is the angle of elevation of a from b.
00:52
Angle 3 is the angle of depression of c from b.
00:58
And angle 4 is the angle of elevation of b from c.
01:06
Next we have a bird at the top, in a person standing on top of a building and a person in a car.
01:18
Let's see that.
01:19
So angle 5 is the angle of depression of the man in the building and also the person in the car from the bird.
01:33
Angle 6 is the angle of elevation of the bird from the person standing on top of the building.
01:42
And angle 7 is the angle of depression from the angle of depression of the car from the person on top of the building.
01:53
And angle 8 is the angle of elevation of the man standing in the building on top of the building from the person inside the car.
02:05
Now let's look at the other sets of diagrams here.
02:10
Here we have birds, we have the ship and the submarine.
02:16
So angle one is the angle of depression of the ship from the birds.
02:22
Angle two is the angle of elevation of the birds from the ship.
02:27
Angle three is the angle of depression of the submarine from the ship.
02:32
And angle 4 is the angle of elevation of the ship from the submarine.
02:39
Finally, we have a diagram where there's an aeroplane, a person on top of a cliff and a ship.
02:51
So angle 5 is the angle of depression of the person from the aeroplane...