1. The problem statement, all variables and given/known data Attached 2. Relevant equations 3. The attempt at a solution I am to provide a solution without using any trigonometry or calculus, but I can't find a way. To clarify, I must find d(x). Involving trig, the problem is trivial, as the angle "A" is equal to arctan(5/4), and then the law of cosines is applied, this is my result on the attachment. How could you solve this without involving trigonometry?