1. 8.1-Law of the Sines 33 22 11 Law of the Sines & Requirements Examples Practice Problems

2. Law of the Sines 2

3.  Requirements  Two sides and an angle opposite to one of them SSA  Two angles and any side AAS or ASA  If these conditions are not met, the problem cannot be solved with the Law of the Sines 3

4. New Calculator Tools  Arcsine  sin -1  Arc-cosine  cos -1  Arctangent  tan -1 4

5. New Calculator Tools (Cont.)  Reverse the trig function process, where: the arc functions provide for: 5

6. Example 6

7. Example (Cont.) 7

8. Another Example 8

9. Another Example (Cont.) 9

10. Tips  Check your calculator settings  Remember the sum of all angles in a triangle is 180 degrees or pi radians  Not all problems can be solved with the Law of Sines 10

11. Practice Problems  Page 577 Problems 1-18 11