9-3

In chapter 9 section 3 it is dealing with the law of sines. The law of sines has 2 steps to follow: used with non-right triangles, only use when you have an angle and opp leg value you know.

The formula for law of sine is sin(angle)/opp leg=sin(angle 2)/ opp leg 2
*cross multiply to solve

Example is in triangle rst if so find all possible measure of
Sin 126^o/12* sin t/7=12sint=7sin126= sin t= 7 sin 126degrees/12

You get 28.159degrees which is your answer.

Example 2:
Solve for x if one angle is 60 degrees another 25 degrees and a side is 8.
Sin 60 degrees/8=sin 25degrees/x = xsin60degrees=8sin25degrees you divide sin 60 degrees you get 3.904 as your answer.

Basically law of sine can be tricky at times but if you on a role and know everything you will make law of sine your pet and own at it.