TOPIC 9: TRIGONOMETRY ~ MATHEMATICS FORM 2
Do you want to learn the relationships involving lengths and Angles of right-angled triangle? Here, is where you can learn.
Angles of Elevation and Depression
Angle of Elevation of an Object as seen by an Observer is the angle between the horizontal and the line from the Object to the Observer’s aye (the line of sight).
See the figure below for better understanding

Angle of depression of an Object which is below the level of Observer is the angle between the horizontal and the Observer’s line of sight.
To have the angle of depression, an Object must be below the Observer’s level. Consider an
illustration below:
The angle of depression of the Object from the Object is β
Problems involving Angles of Elevation and Angles of Depression
Solve Problems involving angles of elevation and angles of depression
Example 5
Exercise 1
- cos 38.25
- sin 56.5
- tan 75
- sin x = 0.9107
- tan x = 0.4621
3. Find the height of the tower if it casts a shadow of 30 m long when the angle of elevation of the sun is38.
5. A ladder of a length 15m leans against a wall and make an angle of30with a wall. How far up the wall does it reach?
Howdy! I know this is kinda off topic but I was wondering which blog platform are
you using for this site? I’m getting sick and tired of WordPress because I’ve had issues with
hackers and I’m looking at alternatives for another platform.
I would be awesome if you could point me in the direction of a good platform.
How to download the notes