Question

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Answer 1

Answer:

A = 31.68°

B = 109.45°

C = 38.92°

Step-by-step explanation:

Law of cosine: cosA = (b²+c²-a²) / 2bc

a = x = 10        b = 18        c = 12

cosA = (18² + 12² - 10²) / 2*18*12 = 368/432 = 0.851

A = 31.68

cosB = (10² + 12² - 18²) / 2*10*12 = -80/240 = -1/3 = -0.333

B = 109.45

cosC = (10² + 18² - 12²) / 2*10*18 = 280/360 = 0.778

C = 38.92

check: A+B+C = 31.68 + 109.45 + 38.92 =180.05 ≈ 80°

Wish this help!!