Hello; essentially, I’m new to trig, and cannot figure out the problem below. I am able to manage what I would consider straight forward Right Triangles, but this one has a wee bit on the end, that I do not know how to sort out.

I believe using SOH-CAH-TOA (new term for me) is the right method to solve this, as (again I believe) Sine requires 2-angle/sides, and Cosine requires 1-angle/side…?

Best I was able to manage was figure out Angle D (180-90-30 = 60).

Additionally, I thought that the red forward arrows (hash-marks) meant that two-sides were equal, but I’m not sure in this case. I would appreciate knowing what these marks indicate.

I would appreciate any help on how to approach and solve this problem. I’m one of those people who require a good example to draw upon for future reference.

Thanks in advance for the forums help!