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Reference Angles & Trig Functions
Contributed by: Kuester

Which of the following is a reference angle for

θ = 158?

22

58

202

-202

Which of the following is a reference angle for

θ = 312?

78

-48

-78

48

Which of the following is a reference angle for

θ = 117?

297

57

83

63

Which of the following is a reference angle for

θ = 236?

54

56

74

36

Which of the following is a reference angle for

θ = -120?

30

60

240

20

Evaluate:  cos(-225)
-√2/2 

√2/2

√2

2

Evaluate:  tan 225

-1

1

√3

√3/3

Evaluate:  tan 330

-√3/3

√3

-√3

1

Evaluate:  sin 240

-√2/2

-1/2

-1

-√3/2
Evaluate:  cos 135

1

√2/2

√3/2

-√2/2

Evaluate:  sin 210

1/2

√3/2
-1/2

-√3/2

Evaluate:  cos(-270)

-1

1

Undefined

Evaluate:  cos 315
√2/2
√3/2

-√3/2

-√2/2

Evaluate:  tan 405

√2/2

-1

-√2/2

1

Evaluate:  sin 450

-1

0

Undefined

Evaluate:  cos (-135)
√2/2

-1

-√2/2

√3/2

Which of the following is a reference angle for -225?

135

65

-25

 45 
Which of the following is a reference angle for 312?

-48

28

-12

48 
Which of the following is a reference angle for -25?

135

65

-25

25 
Which of the following is a reference angle for 1280?

560

200

80

20 
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