3 years ago

If in triangle ABC, a=5, b=6 and c=8, then cos A is...

1 answer:

s2008m [1.1K]3 years ago

5 0

In a triangle, the nomenclature is that a variable side a is opposite of the angle A. we can use the cosine law to determine the value of cosine A.
a2 = b2 + c2 -2bc cos a25 = 36 + 64 - 2*6*8 * cos acos a = 25/32

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