Need Help figuring out this block
I have searched and searched and cannot find instruction on how to complete this block. I have unfinished 12.5" blocks that I want to set in a wonky fashion like the picture I attached (I found under google images). How do I figure out the angles? I think I want the finished total block to be either 14" or 16". My brain is so tired and I knew someone on this wonderful forum knows the answer. Please help.