Download Slide 1

Directions
1. Fold the top right
corner to meet
the bottom.
2. Write your name
& “Trig Book”.
3. Staple the
hypotenuse.
4. Punch hole in the
left side.
Dr. Jennifer L. Bell, ©2009, LaGrange High School, LaGrange, Georgia (MCC9‐12.G.SRT.6; MCC9‐12.G.SRT.8)
Term:
Trigonometry
Definition:
A ratio of the
lengths of the sides
of a right triangle
are called the
trigonometric ratios.
Term:
e
Pronounced “sign”
Definition:
Example:
sin θ = 4
5
opposite 4
opposite
hypotenuse
θ
x
Procedure:
15°
(13) sin 15° =
Find missing
side length
x
(13)
13
(13) sin 15° = x
3.36 ≈ x
(x) sin 15° = 8
sin 15° sin 15°
30.91 ≈ x
8
8
(x) sin 15° = x (x)
15°
Term:
ine
Pronounced “co-sign”
Definition:
adjacent
hypotenuse
Example:
cos θ = 3
5
θ
adjacent 3
Term:
gent
Definition:
Example:
tan θ = 4
3
opposite 4
opposite
adjacent
θ
adjacent 3
Procedure:
Find missing
angle measure
6
cos x° =
10
cos-1 (6/10) = x
cos
53.13° ≈ x
x°
6
2nd
Term:
complementary
angle ratios
Definition:
sin θ = cos (90 - θ)
cos θ = sin (90 - θ)
sin 20° =
x
= cos 70°
5
x
Example:
70°
20°
Term:
angle of
elevation
angle of
elevation
= angle of
depression
Definition:
20
15
angle made
between the
ground
(horizontal) and
the line of sight
when looking up
at the object
θ
20
Term:
angle of
depression
Definition:
20
θ
15
angle made
between the
horizontal
(parallel to the
ground) and the
line of sight when
looking down at
the object.
20
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Example:
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