Quadrilateral trig Question

[ciluvmathf]

Hi, I have been stuck at this question for hours and cannot find a solution. How would I go about doing this question?

 

[Dr.Peterson]

One way might be to draw a horizontal line and a vertical line through B, forming two right triangles. Do you see that x is the sum of the vertical legs of these triangles?

Generally, any right triangle you can make is a good idea.