A vertical mast [xy] stands on a level ground. A straight wire joins y, the top of the mast to t, a point on the ground. The point r is 50m from x, the base of the mast.

(i) Find the height of the mast |xy| if |<ytx| = 56.31 degrees.

(ii) A second straight wire joins y to k, another point on level ground. The length of this wire is 100m, find |<ykx|

Can somebody do this for me? I'm having serious trouble. I have like 10 similar ones of these to do.