part 1
Sine Cosine Tangent
Sine, Cosine and Tangent are each a ratio of sides of a right angled triangle:
href=”http://myriverside.sd43.bc.ca/riannaw2015/files/2017/05/sin-cos-tan-u2tyy9.png”>

Sine Law
you use sine law when you know 2 sides of an angle and you want to find the measure of opposite a known side. Or when you know 2 angles and 1 side and want to get the side opposite a known angle. But in both cases, you must know a side and an angle that are opposite of each other.
src=”http://myriverside.sd43.bc.ca/riannaw2015/files/2017/05/formula-picture-law-of-sines2-1d85t27-300×202.png” alt=”” width=”300″ height=”202″ class=”alignnone size-medium wp-image-268″ />

cosine law
The law of cosines for calculating one side of a triangle when the angle opposite and the other two sides are known. Can be used in conjunction with the law of sins to find all sides and angles.
http://hyperphysics.phy-astr.gsu.edu/hbase/imgmth/lcos.gif