In this demonstration, it is possible to change the positions of two vectors, A, colored red and C, colored blue, by clicking and dragging the heads of the vectors. The angle between these vectors is displayed as an arc, except in the case when it is a right angle, in which case it is displayed as a square. The vector ((A * C)/(C * C))C is shown in white, along with the vector (A - ((A * C)/(C * C))C) with base ((A * C)/(C * C))C, which is shown in green.