Final answer:
The perimeter is the visual line where the ends of the hair hang together, defining the haircut's outline and shape.
Step-by-step explanation:
The perimeter is the visual line in the haircut where the ends of the hair hang together. When cutting hair, the perimeter defines the outer edge of the haircut, and it is important because it influences the overall shape and look of the haircut.
For example, if someone has a blunt haircut, the perimeter line will likely be a straight line across the bottom of the hair that defines the haircut's length and shape. While in a layered haircut, the perimeter might be less even due to the varying lengths of the layers, but it still represents the outermost tips of the hair that create the overall outline of the cut.
It's essential for hairstylists to accurately create the perimeter to ensure that the haircut appears clean and professionally done. This line helps to establish the haircut's silhouette, whether it's on a straight, wavy, or curly hair type. In contrast, an outline in the artistic sense is a line that defines the shape of an object, similarly to the way a perimeter defines the haircut.