1. The first of 2 laws specifically for non-right triangles
8-1 Law of Cosines
The first of 2 laws specifically for non-right triangles

2. Notice: Non-right Triangles
We will be using this law when the information given fits SSS or SAS patterns.
Watch the derivation: You don’t have to reproduce it, just be able to follow it.

3. B c a y x A C b
Law of Cosines

4. B c a A C b

5. Area Formula B c a y x A C b

6. Example Solve ΔABC if a = 3, c = 5 and B = 41º.
Now, tonight you might be asked to solve for only one thing. On the review sheet and test you will solve for everything. To the homework: drop 11, 24