The law of cosines Quiz

Name: ______________________   Date: __________   Score: ____ / 10

10 questions. Calculator allowed. Show your working. steplyclass.com/trigonometry/the-law-of-cosines/quiz/

1. 1

   Triangle a = 5, b = 7, C = 60°, find c
   1. A) c ≈ 6.2
   2. B) c ≈ 1.4
   3. C) c ≈ 39
   4. D) c ≈ 35

2. 2

   Triangle b = 6, c = 10, A = 90°, find a

   Answer: ____________________

3. 3

   Triangle a = 8, b = 11, C = 40°, find c
   1. A) c ≈ 50.18
   2. B) c ≈ 2.6
   3. C) c ≈ 71
   4. D) c ≈ 7.1

4. 4

   Triangle b = 6, c = 9, A = 120°, find a

   Answer: ____________________

5. 5

   Triangle a = 12, c = 10, B = 35°, find b
   1. A) b ≈ 6.9
   2. B) b ≈ 69
   3. C) b ≈ 1.8
   4. D) b ≈ 47.39

6. 6

   Triangle a = 5, b = 8, C = 25°, find c

   Answer: ____________________

7. 7

   Triangle a = 5, b = 7, c = 8, find C
   1. A) C ≈ 81.8°
   2. B) C ≈ 8.18°
   3. C) C ≈ 64°
   4. D) C ≈ 818°

8. 8

   Triangle a = 6, b = 7, c = 9, find C

   Answer: ____________________

9. 9

   Triangle a = 9, b = 7, c = 5, find A
   1. A) A ≈ 7°
   2. B) A ≈ 81°
   3. C) A ≈ 95.7°
   4. D) A ≈ 957°

10. 10

    Triangle a = 8 cm, b = 6 cm, c = 5 cm, find B

    Answer: ____________________