Final answer:
The type of over-direction used when cutting a triangular one length below the shoulders haircut is over-direction to the opposite side.
Step-by-step explanation:
When cutting a triangular one length below the shoulders haircut, the type of over-direction used is called over-direction to the opposite side.
Over-direction is a technique used in haircutting to create volume or remove weight from a specific area. It involves combing the hair in a direction opposite to where it will ultimately fall. In the case of a triangular one length below the shoulders haircut, the hair is over-directed to the opposite side of the triangle. This helps achieve balance and consistency in the haircut.
For example, if the triangular shape of the haircut is created by sectioning the hair into three parts (left, right, and back), the over-direction would involve combing the hair from the left section to the right section or vice versa.