1. The problem statement, all variables and given/known data A cube is positioned with its vertices at the following points: A=(0,0,0) C=(1,1,0) E=(0,0,1) G=(1,1,1) B=(1,0,0) D=(0,1,0) F=(1,0,1) H=(0,1,1) What is the angle of intersection of the planes formed by the triangles EBC and ECD 2. Relevant equations AB=ABcosθ Ab=Absinθ 3. The attempt at a solution I am stuck on this one. I drew a picture but I can seem to figure anything out. Could somebody give me a hint?