The question is this; In the diagram X, Y and Z represent the locations of three towns. The town Y is due eat of X and the bearing of Z from Y is 046degrees

I have done section i and ii

(correct me if i am wrong)

for

i) Angle, xyz = 90 + 46 = 136 degrees.

ii) Then i use Cosine rule to find a side which the side equals 37.1km.

iii) However this is where i have become stuck... this is due in 5 days so i have time but its the weekend, and i dont have math those days... can anyone explain this to me thanks