Question

Using the laws of cosines find the indicated angle. Round to the nearest tenths.​

Answer 1

5. 70.5°

6. 68.7°

7. 37.3°

8. 81.5°

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