College Algebra & Trigonometry, 2018a

11.3. THE LAW OF COSINES 495
Exercises 11.3
In each problem, solve the triangle.
Round side lengths to the nearest 100 th and angle measures to the nearest 10 th .
C
24
30 ◦ B
A
14
40 ◦
C
30
20
1. A
2.
B
60
C
122
C
38
68
3.
A
154 B
4.
A
42
B
5. ∠A =52 ◦ , c =27, b =36 6. ∠B =75 ◦ , a =32, c =59
7. ∠B = 135 ◦ , a =12, c =18 8. ∠C = 120 ◦ , b =22, a =30
9. a =21, b =26, c =23 10. a =11, b =13, c =17
11. a =25, b =32, c =40 12. a =60, b =88, c = 120
13. ∠A =77.4 ◦ , b = 444, c = 390 14. ∠B =10 ◦ , a =18, c =30
15. a = 112.7, b =96.5, c = 130.2 16. a =4.7, b =3.2, c =5.9