6. 4. A closed circuit television camera is
mounted on a wall 7.4 feet above a security
desk in an office building. It is used to view
an entrance door 9.3 feet from the desk.
Find the angle of depression from the
camera lens to the entrance door.
7.4 feet
?
?
9.3 feet
7. 5. The world’s longest escalator is the
Leningrad Underground in Lenin Square. The
escalator has an angle of elevation of 10.36°
and a vertical rise of 195.8 ft. Find the
length of the escalator.
195.8 feet
10.36°
?
8. 6. Find the height of a flagpole which
casts a shadow of 9.32 m when the sun
makes and angle of 63 to the horizontal.
9.32 m
63
63
?
9. 7. A train must climb at a constant
gradient of 5.5 m for every 200 m of
track. Find the angle of incline.
5.5 m
?
22. What happens if you don’t
know the height???
There are some cases where you don’t
need the height to find the area…
23. What happens if you don’t
know the height???
There are some cases where you don’t
need the height to find the area…
You have two sides and the
included angle
24. Labeling a Triangle
If you have a triangle ABC with
angles A, B, C the sides opposite
these angles are a, b, c
25. Formula for the Area of a Triangle
when you have 2 sides and the included
angle.
The area of triangle is half of the
product of two sides and the sine of
the included angle