In triangle ABC, angle C is 90 BC 2√15 AB 8 find cosA
| June 16, 2021 | education
1) Cosine A – the ratio of the adjacent leg to the hypotenuse.
That is, cos A = AC / AB
2) From a right-angled triangle we find AC (by the Pythagorean theorem)
AC ^ 2 = AB ^ 2 – BC ^ 2
AC ^ 2 = 64 – 60 = 4
AC = 2
3) cos A = 2/8 = 0.25
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