Lesson 4

Lesson 4 Summary

 

In this lesson you examined when each formula is appropriate.

 

You learned that the sine law is appropriate when

• there is only one unknown in your sine law equation

• you have correctly paired sides and angles (i.e., the side-angle pair for each fraction must be across from each other)

You also learned that it is appropriate to use the cosine law when

• there is only one unknown in your cosine law equation

• you have correctly paired side a and angle A (i.e., they must be across from each other)