In triangle ABC, angle C is straight, AC = 8, cosA = 0.4. Find AB.

univerkov | May 30, 2021 | education

In the triangle ABC cosA = AC / AB, then we express the side AB from this equality. We get cosA * AB = AC, AB = AC: cosA. According to the condition of the problem AC = 8, cosA = 0.4, we substitute these values into the obtained equality AB = AC: cosA and find the value of the expression. Therefore, AB = 8: 0.4 = 80: 4 = 20.
Answer: AB = 20

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