Plug the values into this equation:
c=
a
2
+
b
2
﹣
2
a
b
cos
γ
PROBLEM 1
PROBLEM 2
REFLECTIONI like using "SOHCAHTOA." You can never go wrong using it. Just plug in the numbers and divide!
ADDITIONAL RESOURCES
http://www.mathsisfun.com/algebra/trig-cosine-law.html
