In triangle ABC, angle C = 90 degrees BC = 2 cosB = 0.4 find AB.
| September 21, 2021 | education
In a right-angled triangle, the cosine of an acute angle is equal to the ratio of the length of the leg adjacent to the angle to the length of the hypotenuse of the triangle.
CosB = BC / AB.
AB = BC / CosB = 2 / 0.4 = 5 cm.
Answer: the length of the hypotenuse AB is 5 cm.
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