Find the side of the triangle opposite 120 degrees if the adjacent sides are 14 mm and 16 mm.
| December 16, 2020 | education
Cosine theorem
X ^ 2 = 14 ^ 2 + 16 ^ 2-2 * 14 * 16 * \ cos120 ^ 0
X ^ 2 = 196 + 256 – 2 * 14 * 16 * (- 0.5)
X ^ 2 = 196 + 256 + 14 * 16
X ^ 2 = 196 + 256 + 224
X ^ 2 = 676
x = 26
The answer is the desired side is 26 mm.
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