Final answer:
To accommodate a growth pattern such as a widow's peak, cowlick or whorl when cutting the hair, allow additional length in the growth pattern area.
Step-by-step explanation:
Hair growth is a complex process that occurs in three phases: anagen, catagen, and telogen. During the anagen phase, which can last for several years, cells divide rapidly at the root of the hair, pushing the hair shaft up and out. On average, hair grows at a rate of 0.3 mm per day during this phase. To accommodate growth patterns such as a widow's peak, cowlick, or whorl, it is important to allow additional length in these areas when cutting hair. This ensures that the natural growth pattern is taken into account and helps to prevent any potential issues or unevenness in the final haircut.