Similar Triangles & Law of Sines and Cosines

This video is about the similarity in triangles and how to solve an unknown side when knowing a similar one. I think that this topic is pretty easy because we know the Regla de 3 since we were in elementary school. It gets a little bit confusing when more than 1 x is involved, but if you understand the equation well, it's easy to solve. 

In this video, the teacher explains that if you know two angles and a side of a triangle, you can get the 3rd angle and the two missing sides by using the law of sines. I think that the video was very clear and well explained with all the graphics. Even though we haven't seen this topic I think it seems easy but that if you confuse something you can mess up the whole equation, for example in the last part it can be a little confusing.