Trying to build a desk. Have all the standard measurements but having issues figuring out what the angles I need for the support beams I have attached a drawing the blue circles are the angles that I need to figure out. Also I need to know how long my beam has to be before being cut(green line). I don't just want the answer, although it will be appreciated but I also want to know how to solve this problem in the future. Thanks in advance for all your help.
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