For ABC what is the value of cos C?

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Guest May 13, 2015

+33654

+5

Best Answer

Presumably you are referring to a triangle with sides of length a, b and c opposite angles A, B and C respectively. In this case the cosine rule says

cos(C) = (a² + b² - c²)/(2ab)

.

Alan May 13, 2015

Alan · Answer 1 · 2015-05-13T07:45:01

Presumably you are referring to a triangle with sides of length a, b and c opposite angles A, B and C respectively. In this case the cosine rule says

cos(C) = (a² + b² - c²)/(2ab)

.