1. The problem statement, all variables and given/known data Point A (2i +j 2k) Point B (3i +2j +5k) Point C (4i +5j -2k) the point d is such that abcd in that order is a parallelogram. Find position Vector D 2. Relevant equations 3. The attempt at a solution ok so i start of like this but im getting the wrong answer. http://img511.imageshack.us/img511/5946/vectorak5.jpg [Broken] (BA)^1/2=(CD)^1/2 but its wrong.