Question 393065
  <pre><font size = 3 color = "indigo"><b>
Hi
There are other ways this can be solved directly:
Noting this is a right triangle where hyp = 17 and the ratio of sides is 3:4:5
sinA = 3/5 = opp/hyp = a/17     
         .6 *17 = 10.2 = a     |this could have been done in first step prior
cosA = 4/5 = adj/hyp = b/17  
         .8*17 = 13.6 = b      |3:4:5 allows this direct approach in this ex

As to the method used: a reminder the 3/5 is a ratio
sinA = opp/hyp = a/c = 3/5 = 3*3.4/5*3.4 = 10.2/17
As to the '3.4' = 17/5  (transforming the 5 to 17 by a multipling factor)