Final answer:
In a triangular long layered haircut, forward or increased over-direction is typically used, pulling hair towards the front to create shorter layers in the front and longer in the back. Over-direction is the angle at which hair is held while cutting, affecting layer length and overall shape.
Step-by-step explanation:
When cutting a triangular long layered haircut, the type of over-direction typically used is forward or increased over-direction. This technique involves pulling the hair forward towards the front of the head when cutting the layers. This creates shorter layers in the front and longer layers in the back, enhancing the triangular shape of the haircut.
Over-direction can be thought of as the angle at which the hair is held away from the head when cutting. In the context of a triangular layered cut, the hair is pulled forward past its natural falling position. The more you over-direct the hair to the front, the longer the back layers will be in relation to the front layers. This is a deliberate styling choice to achieve the desired look of this specific haircut style.
Finally, in order to maintain the shape and structure of the haircut over time, the stylist must be consistent with the degree of over-direction throughout the cutting process. As such, mastering over-direction is critical for any hairstylist looking to achieve precise and fashionable layered hairstyles.