© 2008  Rasmus ehf
and Jóhann Ísak

Trigonometry sine, cosine and tangent.

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Quiz1 

Instructions to  students.

You might find it easier to print out the quiz and work out your answers on paper. When you are ready, put a check mark by the answers you think are correct and then press the send button. There is only one correct answer to each question.

  1. Find cos 75º

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Possible answers:

A

  0.259

B

  0.966

C

  0.257

2.   Find the angle  x  if tan x = 4 

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Possible answers:

A

 x = 14º

B

 x = 75º

C

 x = 76º

3.     Find the angle  x  if sin x = 1

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Possible answers:

A

 x = 0º

B

 x = 90º

C

 x = 1º

4.      In triangle ABC , angle  C = 90º. Find the angle A if AB = 9 cm and  BC = 4.5 cm.

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Possible answers:

A

   30º

B

   60º

C

   27º

5.   In triangle ABC , angle  C = 90º. Find  AC if AB = 8 cm and angle A = 20.5º

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Possible answers:

A

  3 cm

B

  7.5 cm

C

  2.8 cm

6.    In triangle ABC , angle  C = 90º. Find BC if AC = 85 m and angle A is 27º

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Possible answers:

A

  75.7 m

B

  38.6 m

C

  43.3 m

7.    

Find angle x

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Possible answers:

A

22.6º

B

67.4º

C

24.6º

8.    

        Find the angle C.

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Possible answers:

A

40º

B

36º

C

35º

9.    

        The line segment BD is the angle bisector of < B . Find  AC. 

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Possible answers:

A

 16

B

 17

C

 18

10.    

 John, Chris and Meg are asked to calculate the angle x. John found that tan x = 4/3. Chris that sin x = 3/5.

        Meg said that  cos x = 4/5. Who were correct?

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Possible answers:

A

   John and Chris 

B

  Chris and Meg 

C

  Meg and John

 

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