Now if we multiply this resultant vector a with that of vector u with the method of dot product then we will get the answer to the above question as to how much of the vector u is lying in the direction of the vector v. This implies that u.a which is the dot product is known as the projection of the vector u on the vector a. Let us understand this with the following diagram. Here replace the vector u with vector v in the previous example that we took. The projection of the vector a in the given diagram could be seen as the perpendicular is dropped on the vector u. This forms a triangle as shown in the figure. Let us assume that the angle between the vector a and the vector u is denoted by the theta.