 You might want to review an Introduction to Trigonometry first. 
Finding a Missing Side Example 1: Find side x 
Begin by labelling sides o, a and h x = 62 · sin35 x = 35.6 rounded to 1 d.p. Example 2: Find side x 
 x = 16·cos22 x = 14.8 rounded to 1 d.p. Example 3: Find side x 
   x = 11.0 rounded to 1 d.p. Next let's look at how to find a missing angle >>> |