Given a right-angled triangle ABC with a hypotenuse AB = 10 cm. What is the leg BC if the cosine of angle B is 0.8?

univerkov | November 29, 2020 | education

Cosine is the ratio of the adjacent leg to the hypotenuse.
сv / 10 = 0.8
сv / 10 = 4/5
According to the properties of the proportion: сv = 10 * 4/5 = 8.
сv = 8.
Answer: 8.

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