Sine Or Cosine Rule?

The video explains how to use the sine and cosine rules to find missing sides or angles in triangles that are not right-angled. It emphasizes the importance of labeling sides and angles correctly, with sides labeled as a, b, c and angles as A, B, C, where each side is opposite its corresponding angle. The sine rule requires one complete pair of a side and its angle, and half of another pair. The cosine rule is used when all three sides are known, or when two sides and the included angle are given. The video provides examples and encourages viewers to practice using these rules.

Explain the difference between a complete pair and a half pair in the context of the sine rule.

How can you determine whether to use the sine rule or the cosine rule?