In an acute-angled triangle ABC, the height AH is 9√39, and the side of AB is 60. find cos B.
| September 17, 2021 | education
1. Because АН – height, triangle ABН – rectangular. It is necessary to find the leg – BН, we find it by the Pythagorean theorem. The square of the hypotinus minus the square of the leg.
2. Solving the example, it turns out 21.
3. Cosine is the ratio of the adjacent leg to the hypotenuse. ВН / AB = 21/60. Reduce and convert to decimal.
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