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Trig question help (Determining length)

can someone please help me out.... I have a question and yes it's for homework but I have no idea on how to even begin it.... To me it looks like they already gave the answer or something but I'm not sure how to start or how to do it... Can someone please help me out.

Determine the length of each unknown variable:

How do I solve this? I have no idea on where to even begin... If someone can help me it will be greatly appreciated... I can't show the work I've alreayd done because I don't know how to do this..

Thanks for all the help though if you can answer this

Alright I tried to re-edit it... does it work now?