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## Trigonometry

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### Title: Trigonometry Author: Lorie Andrews Last modified by: Nancy Created Date: 3/14/2011 5:08:04 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Trigonometry

1
Trig SOH CAH TOA
A
B
C
2
WHICH HOUSE WOULD YOU RATHER LIVE IN?
House number 1 OR House number 2?
3
House number 1
4
House number 2
5
Trigonometry
• Trig means angle measurement
• Trig deals with the relation between sides and
angles
• Trig helps you find the length of a side or the
measure of an angle

6
What might you use trig for?
To build a house correctly
gutters? What is the shortest distance between
two points? What is the height and width of a TV
screen? Where will your furniture fit in a
room? What is the height of a building or a
tree? How can you build a staircase?
7
Trigonometric Ratios
• Sine Sin _opposite_
• hypotenuse
• hypotenuse
• Tangent Tan opposite

8
Trig Memory Clue
• SOH CAH TOA
• S ine C osine T
angent
• O pposite A djacent O
pposite
• H ypotenuse H ypotenuse A djacent

9
SIN, COS, and TANFind sine, cosine, and tangent
of acute angles only.
A
Sin
Cos
Tan
5
2
Sin
Cos
B
C
Tan
3
10
B
11
T
L
3
6.7
F
14
17.8
6
Sin Cos Tan
R
Sin Cos Tan
G
11
O
for the red acute angle only.
Y
6
7
12
Y
A
13.4
R
9
Sin Cos Tan
Sin Cos Tan
11.4
X
U
Sin Cos Tan
14.2
9
E
Z
11
12
PRACTICE SIN, COS, and TAN
1.
2.
3.
A
N
A
10
25
8
12
13
24
C
B
L
T
H
S
6
5
7
Sin Cos Tan
Sin Cos Tan
Sin Cos Tan
for both acute angles.
13
R
3
H
A
6.2
7.1
3
A
Sin Cos Tan
Sin Cos Tan
M
M
I
B
3.5
M
A
Sin Cos Tan
Sin Cos Tan
R
B
M
A
R
B
R
B
14
W
4.
5.
D
Sin Cos Tan
16
12
15
Sin Cos Tan
20
Y
J
P
9
V
12
6.
9
N
16
C
Sin Cos Tan
13
L
15
7.
8.
P
3
25
Y
T
E
5
Sin Cos Tan
7
24
4
Sin Cos Tan
I
A
Q
9.
24
10
Sin Cos Tan
G
D
26
16
C
10.
11.
F
6
10
Sin Cos Tan
O
8
S
26
Sin Cos Tan
24
12.
G
15
Z
I
10
E
25
20
Sin Cos Tan
T
17
K
13.
14.
M
Sin Cos Tan
1
S
1
B
2
Sin Cos Tan
W
1
I
15.
F
4
2
Sin Cos Tan
C
H
18
16.
17.
6.2
F
E
L
6.2
B
Sin Cos Tan
3.5
Sin Cos Tan
7.1
7.8
10
O
18.
M
6.4
Sin Cos Tan
T
4.7
D
4.3
U
19
19.
20.
Q
E
Sin Cos Tan
4.1
7.8
7
T
6
G
5.6
Z
5
A
21.
30
B
Sin Cos Tan
Sin Cos Tan
D
34
16
C
20
22.
23.
R
Sin Cos Tan
32
J
I
24
40
25
24
Sin Cos Tan
A
32
B
C
O
24.
48
Sin Cos Tan
14
G
50
L
21
What is the hypotenuse?
• It is always across from the right angle.
• It is always the longest side.

hypotenuse
22
Hypotenuse
A
L
A
E
E
G
C
A
L
A
G
B
23
Practice marking the hypotenuse
A
G
H
1.
2.
B
C
I
E
3.
4.
K
J
L
D
F
24
Practice marking the hypotenuse
A
C
A
6.
5.
B
C
A
8.
C
B
B
7.
A
C
B
25
Practice marking the hypotenuse
A
B
10.
9.
A
C
A
C
C
12.
11.
B
B
B
A
C
26
What is the opposite side?
• It is the side across from the angle youre
working with.

A
The side opposite is
The side opposite is
C
B
27
Opposite Side
O
I
I
Side opposite   Side opposite

K
N
Side opposite
Side opposite
P
K
M
N
P
J
S
D
D
M
V
V
Side opposite   Side opposite
Side opposite Side opposite
S
D
M
28
Practice marking opposite side
A
A
1.
2.
T
C
A
D
B
C
3.
4.
D
O
G
B
29
Practice marking opposite side
E
Y
5.
6.
D
D
C
L
R
I
7.
8.
O
G
P
W
30
Practice marking the opposite side
D
U
10.
9.
F
M
D
G
A
12.
11.
Z
I
A
G
Z
31
• The adjacent side runs alongside the angle (but
it wont be the hypotenuse).

B
A
C
32
B
M
O
1.
2.
ltA
ltB
ltP
ltO
A
C
B
C
R
3.
4.
P
ltA
A
G
ltR
ltA
A
ltB
33
F
N
E
5.
6.
D
U
D
I
R
P
A
7.
8.
L
B
34
O
U
9.
10.
S
F
G
N
W
11.
12.
G
D
A
G
U
35
STRAW ACTIVITY
• You will be given 3 straws and a piece of poster
board.
• Place the straws on the poster board in the shape
of a right triangle
• Label the angles with your initials
• Label the hypotenuse
• I will come around and give you one of the
angles
• You will label the opposite side and the

36
STRAW ACTIVITY EXAMPLE
Using angle L, label the opposite and adjacent
sides
L
hypotenuse
A
T
opposite
37
Practice marking different sides
A
T
1.
2.
D
E
H
I
Y
3.
S
4.
E
V
O
R
38
5.
M
P
P
C
6.
A
A
7.
P
P
8.
A
N
T
A
39
O
T
10.
9.
O
Y
N
U
11.
S
12.
K
M
J
A
V
40
A
13.
14.
M
J
C
D
A
E
15.
N
E
16.
O
W
L
41
Q
Y
17.
18.
R
T
W
E
19.
A
G
20.
F
S
D
H
42
J
21.
22.
L
K
O
M
N
B
C
23.
24.
P
V
I
X