In a triangle ABC AC = BC = 12, AB = 12. Find cos
September 26, 2021 | education
| Since, by condition, AC = BC = 12 cm, and AB = 12 cm, the ABC triangle is equilateral, which means that all its internal angles are 60.
Then CosA = C0s60 = 1/2.
Answer: CosA = 1/2.
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