A uniform rod of length 2L and mass 2m is bent on its center at a right angle. The rod hangs down from the ceiling using a thread, so that one part, AB, is horizontal, and the other part, BC, is vertical. The question is what's the distance (x) between the suspension point D to the point A (the end of the bar). My problem is in building the equations. Shall I refer to the vertical part as a seperate load of weight on the center point B? Which points should I pick to build the equations from? Should the equations be related to the point A? Thanks in advance.