Here is a good explanation of law of cosines:
http://hyperphysics.phy-astr.gsu.edu/hbase/lcos.html
and here for law of sines
http://www.mathwarehouse.com/trigonometry/law-of-sines/formula-and-practice-problems.php
Here is a good explanation of law of cosines:
http://hyperphysics.phy-astr.gsu.edu/hbase/lcos.html
and here for law of sines
http://www.mathwarehouse.com/trigonometry/law-of-sines/formula-and-practice-problems.php