Kaitlyn's Blog #8

In this blog, i will be explaining 9-3 Law of Sines.



You can only use law of sines when you have a non right triangle and if you have a pair, an angle and an opposite leg.



Formula: Sin(angle)/opposite leg=Sin(angle 2)/opposite leg 2



Example: Triangle ABC has A(angle)=32 B(angle)=81.8 and a=42.9 inches. What is the measure of side c?



1) First you need to find your other angle C. You can do this by simply subtracting your other two angles from 180, since a triangles angles add up to 180.



2) Then you use law of sines to find your side c.



3) sin32/42.9=sin66.2/c



4) cross multiply to get c x sin32=42.9sin66.2



5) then divide sin32 on both sides to get c=74.07



So that is how you find you other side using law of sines.