In triangle ABC, angle C = 90 BC = 3√91 AC = 9 Find cosA
| June 9, 2021 | education
By the Pythagorean theorem, we determine the length of the hypotenuse AB.
AB ^ 2 = BC ^ 2 + AC ^ 2 = 819 + 81 = 900.
AB = 30 cm.
CosA = AC / AB = 9/30 = 3/10 = 0.3.
Answer: CosA = 0.3.
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