In a triangle ABC, the angle C is, AB = 30, BC = 24. Find cosA.
| April 12, 2021 | education
Determine the sine of the angle BAC.
SinBAC = BC / AB = 24/30 = 0.8.
Determine the cosine of the angle BAC.
Cos2BAC = 1 – Sin2BAC = 1 – 0.64 = 0.36.
CosBAC = 0.6.
Answer: The cosine of angle A is 0.6.
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