In triangle abc, angle c is 90, bc = 12, ab = 15. Find cosB
| November 28, 2020 | education
Knowing that the cosine of an angle in a right-angled triangle is equal to the ratio of the adjacent side to the hypothesis, we compose the formula (equation):
CosB = bc / ab
CosB = 12/15
CosB = 0.8
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