Those two different laws work for any triangle:
Sine Law (The Law of Sines): 
(for solving side lengths)
↓or
(for soving angles)
Cosine Law (The Law of Cosines):
(for solving side lengths)
↓or
(for solving angles)
How to use them?
Example 1- Calculate side c (Sine Law)
Example 2- Calculate side c (Cosine Law)
