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Geo Chapter 8 Trigonometry pt.1
Contributed by: DiLaura
5.8
6
4
4√3
12
Find the length of AB in the triangle.
Note: √ = the square root
A
C
8
60o
B
5.8
Find the hypotenuse of the right triangle.
Note: √ = the square root
8
8√2
8√3
16
45o
8
5.8
What angles goes here?
30
45
Match the sides
5.8
30
2x
?
x√3
?
60
x
?
Match the sides
5.8
45
x√2
?
x
45
x
?
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
y
x
60o
9
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
6
x
60o
y
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
x
16
60o
y
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
x
11√3
60o
y
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
x
45o
11
y
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
x
45o
y
4
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
x
45o
y
12√2
5.8 
x = 
y = 
Find the value of x and y. Round your 
answer to the nearest tenth.
x
45o
y
18
What is the 
cos 45o ?
√3/2
1/2
√2/2
0
unit circle
What is the cos 60o ?
unit circle
√3/2
1/2
√2/2
0
What is the cos 300o ?
unit circle
1
1/2
√2/2
0
What is the cos -60o ?
unit circle
1
1/2
√2/2
0
What is the sin 30o ?
unit circle
1
1/2
√2/2
0
What is the sin -300o ?
unit circle
1/2
√3/2
√2/2
0
What is the sin 540o ?
unit circle
1
1/2
√2/2
0
What is the sin 90o ?
unit circle
1
1/2
√2/2
0
What is the sin 210o ?
unit circle
-1
-1/2
-√3/2
0
(-√2/2, -√2/2)
?
(-√2/2, √2/2)
?
Drag the coordinates below to their correct location on the unit circle.
unit circle
(√2/2, -√2/2)
?
(√2/2, √2/2)
?
unit circle
(-√3/2, -½)
?
Drag the coordinates below to their correct location on the unit circle.
(-½, √3/2)
?
(-1, 0)
?
(0, -1)
?
(0, 1)
?
(½, -√3/2)
?
(1, 0)
?
(√3/2 , ½)
?
8.2.1
Use the triangle below to write the 
ratio for Sin A
A
Sin A = 
15
13
B
C
8
8.2.1
Use the triangle below to write the ratio for Sin B
A
Sin B = 
15
13
B
C
8
8.2.1
Use the triangle below to write the ratio for Cos A
A
Cos A = 
15
13
B
C
8
8.2.1
Use the triangle below to write the ratio for Cos B
A
Cos B = 
15
13
B
C
8
8.2.1
Use the triangle below to write the ratio for Tan A
A
Tan A = 
15
13
B
C
8
8.2.1
Use the triangle below to write the ratio for Tan B
A
Sin A = 
15
13
B
C
8
8.2.1
Which side (leg) is opposite the 30 angle?
30

c

a

60

b
side a

side b

side c

side d

8.2.1
Which side (leg) is opposite the 60o angle?
30

c

a

60

b
side a

side b

side c

side d

8.2.1
Which side (leg) is adjacent to the 30 angle?
30

c

a

60

b
side a

side b

side c

side d

8.2.1
Which side is opposite the 90o angle?
30

c

a

60

b
leg a

leg b

hypotenuse c

hippopotamus d

8.2.1
Given the triangle below find the missing side lenght x to the nearest tenth.
x = 
50o
18
x
8.2.1
Given the triangle below find the missing side lenght x to the nearest tenth.
x = 
50o
7
x
8.2.1
Given the triangle below find the missing side lenght x to the nearest tenth.
x = 
12
25o
x
8.2.1
Given the triangle below find the missing side lenght x to the nearest tenth.
x = 
65o
3
x
8.2.1
Given the triangle below find the missing side lenght x to the nearest tenth.
x = 
15
x
78o
8.2.1
Given the triangle below find the missing side lenght x to the nearest tenth.
x = 
18o
12
x
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