- Choice D
The Law of Cosines (also called the Cosine Rule) :
$$ c^2=a^2+b^2-2ab\cos C=80^2+120^2-2\times 80 \times 120 \cos 127°=180 $$
Skills you are tested for:
Was this explanation helpful?
The Law of Cosines (also called the Cosine Rule) :
$$ c^2=a^2+b^2-2ab\cos C=80^2+120^2-2\times 80 \times 120 \cos 127°=180 $$
Comments