Answer:
5. 70.5°
6. 68.7°
7. 37.3°
8. 81.5°
Step-by-step explanation:
Using cosine law:
5. 27² = 26² + 20² - 2(26)(20)cosA
cosA = 347/1040
A = 70.5093002
6. 13² = 12² + 11² - 2(12)(11)cosB
cosB = 4/11
B = 68.67631384
7. 11.7² = 16.5² + 19.2² - 2(16.5)(19.2)cosB
cosB = 35/44
B = 37.30179029
8. 14.1² = 8.8² + 12.4² - 2(8.8)(12.4)cosC
cosC = 3239/21842
C = 81.46493914
