Let A and B be two vectors. A × B = |A| |B| sin(Ф) where |A| = magnitude of A |B| = magnitude of B Ф = angle between A and B If you draw a parallelogram with sides as vector A and B The area of the parallelogram will be |B|h as shown in figure. But h = |A| sin(Ф) So area = |B|h = |A| |B| sin(Ф) = A × B
