my calculator is in degrees mode.
1 Construct the given sided triangle. The x angle will be obtuse. By using th Pythagorean T solve for the segments on the 18 base created by the altitude on it
2 use simple trig to find the two acute angles which added will be the angle x
Hi again andyboy,
What course are you taking? I assume its Trig or Advanced Math. You were having a lot of trouble so I explained a method that does not need the cosine rule for a 3 sided triangle. This method showed x= 117.9. It was a long way to Tipperary but you got there. The same result is obtained when you use -.468 for the value of cos x - 103/220