Law of Cosines

Side a

Side b

Side c

Cannot be determined

$$\angle A$$  

$$\angle B$$  

$$\angle C$$  

Cannot be determined

 side a

 side b

 side c

Cannot be determined

The square of any side of a triangle is equal to the sum of the squares of the other two sides minus the product of these sides and the cosine of their included angle.

It is used to solve problems involving oblique triangles given two sides and an excluded angle.

It is used to solve problems involving oblique triangles given three angles.

None of the above

$$\angle A$$  

$$\angle B$$  

$$\angle C$$  

Cannot be determined

$$74^o$$  

$$75^o$$  

$$76^o$$  

$$77^o$$  

8

9

10

11

$$39^o$$  

$$38^o$$  

$$37^o$$  

Undefined