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adoni [48]
4 years ago
11

Find B. Round to the nearest tenth!!!!! please help ASAP!!!!!!! trigonometry!!!!!​

Mathematics
1 answer:
neonofarm [45]4 years ago
4 0

Answer:  56.0°

<u>Step-by-step explanation:</u>

Use the Law of Cosines:

b² = a² + c² - 2ac · cos B

20² = 22² + 18² - 2(22)(18) · cos B

400 = 484 + 324 - 792 · cos B

400 = 804 - 792 · cos B

-404 = - 792 · cos B

0.5151 = cos B

cos ⁻¹ (0.5151) = B

55.99 = B

56.0 ≈ B

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