1. The problem statement, all variables and given/known data In a methane molecule, determine the length of the distance between a hydrogen atom at A and the carbon atom at O (see diagram) in terms of the length of the edge (e) of the cube at four of whose corners the hydrogen atoms rest. 2. Relevant equations pythagorean theorem? 3. The attempt at a solution The first part of the problem asks to find AB (see diagram). AB= e(sqrt-2). The book gives the answer as AO=e(sqrt-3)/2, but I don't know how they got it. I'm sure this is simple! I'm just not having any luck. Thanks!