In triangle ABC, angle C is 90 degrees. BC = 20, AB = 25. Find cosB.
| September 10, 2021 | education
A triangle in which one angle is 90º is called rectangular.
The cosine of an acute angle of a right-angled triangle is the ratio of the adjacent leg to the hypotenuse:
cos B = BC / AB;
cos B = 20/25 = 4/5 = 0.8.
Answer: the cosine of an acute angle ∠B is equal to 0.8.
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