Law of Cosines
Round angle measures to the nearest minutes and side measures to the nearest tenth.
Solution
Given
1. a = 1.5, b = 2.3, c = 1.9
2. b = 40, c = 45, A = 51
3. A = 52, b = 120, c = 160
4. a = 15, b = 18, c = 17
5. A = 42, b = 120, c = 120
6. a = 15, b = 18, c = 20
7. b = 12, a = 20, c = 28
8. a = 12.5, b = 15.1, c = 10.3
9. c = 49, b = 40, A = 53
10. a = 10, c = 8, B = 100
Work
Law of Cosines KEY
Round angle measures to the nearest minutes and side measures to the nearest tenth.
Solution
Given
1. a = 1.5, b = 2.3, c = 1.9
A=
40.459
B=
84.261
C=
55.280
a=
36.871
B=
57.469
C=
71.531
2. b = 40, c = 45, A = 51
a=
127.901
B=
47.675
C=
80.325
3. A = 52, b = 120, c = 160
A=
50.655
B=
68.127
C=
61.218
4. a = 15, b = 18, c = 17
a=
86.008
B=
69
C=
69
A=
46.128
B=
59.890
C=
73.983
6. a = 15, b = 18, c = 20
A=
38.213
B=
21.787
C=
120
7. b = 12, a = 20, c = 28
A=
55.127
B=
82.339
C=
42.534
8. a = 12.5, b = 15.1, c = 10.3
a=
40.520
B=
52.035
C=
74.965
9. c = 49, b = 40, A = 53
A=
45.326
B=
13.849
C=
34.674
10. a = 10, c = 8, B = 100
Work
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5. A = 42, b = 120, c = 120
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