1. All about right triangles
Unit 8 - Trigonometry
All about right triangles

2. Notes pages 10–11

3. ∠ elevation = ∠ depression
horizontal
intersecting
Line of sight
horizontal
horizontal
intersecting
Line of sight
∠ elevation = ∠ depression

4. T
__OA
cos 78 5
_____ ___ = ___ x O x H 78 5 A

5. cos 78 5 x 1 x = 5/ cos 78 = 24.048 x = 24.05 T _____ ___ = ___ __OA x
_____ ___ = ___ x O x 1 H 78
x = 5/
cos
78 =
24.048 5 A
x =
24.05

6. T
__OA
tan x
12.5
_____ ___ = ___ 18 O H
12.5 x 18 A

7. tan x 12.5 18 tan-1( 12.5 /18) = ____ 34.777 x = 35o T _____ ___ = ___
__OA
tan x
12.5
_____ ___ = ___ 18 O H
12.5
tan-1(
12.5
/18) = ____
34.777 x
x =
35o 18 A

8. tan 40
_____ ___ = ___
13.25 x T
__OA H O 40
13.25 X A

9. tan 40 x 1 = _____ ___ = ___ T x tan 13.25 40 tan 13.25 tan 13.25 x =
_____ ___ = ___
13.25 x 1 T
__OA H O 40 = x
tan
13.25 40
tan 13.25
tan 13.25
13.25 X A
x =
40/
tan = _____
169.87

10. S
__OH
sin x
208
_____ ___ = ___
1000 H O
1000
208 x A

11. sin x 208 1000 sin-1( 208 /1000) = ____ 12.005 x = 12o S
__OH
sin x
208
_____ ___ = ___
1000 H O
1000
208
sin-1(
208
/1000) = ____
12.005 x A
x =
12o