QW: Law of Cosines

What is the Law of Cosines primarily used for in trigonometry?

• To find the area of a triangle

• To find the lengths of sides in a right triangle

• To find the lengths of sides or the measures of angles in any triangle

• To prove triangles are congruent

What are the conditions where the Law of Cosines can be used?

• SAS & SSS

• ASA & AAS

• SSA & ASA

• SSA, AAS & ASA