Final answer:
In a triangular graduation haircut, forward over-direction is typically used to create the desired graduated shape that is shorter in the front and longer towards the back.
Step-by-step explanation:
When cutting a triangular graduation haircut, the type of over-direction typically used is forward over-direction. This means that the hair is combed forward from the back of the head towards the front during the cutting process. By directing the hair forward, the hair at the back is left longer, creating a graduated effect that is shorter in the front and longer towards the back. This technique is crucial for achieving the desired triangular shape in the haircut. It's important for stylists to understand and apply this method correctly to create balanced and symmetrical triangular graduated cuts.