In triangle ABC, angle C is 90, AB = 10, BC = 8. Find cosA.
| March 25, 2021 | education
The cosine of an angle is the ratio of the adjacent leg to the hypotenuse.
By the Pythagorean theorem, we find the leg AC:
AC = √ (AB² – BC²) = √ (100 – 64) = √36 = 6;
cos A = AC / AB = 6/10 = 0.6.
Answer: cos A is 0.6.
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