Adding two vectors graphically by placing the tail of one at the head of the other is the:

1. Vectors add geometrically rather than as plain numbers. 2. The head-to-tail method is a graphical way to add vectors. 3. Each vector is drawn starting where the previous one ended. 4. The sum is then read off from the start of the first to the end of the last. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 3 'Two-Dimensional Kinematics', sections 3.1-3.4_