Which of the following shapes is used to move the hair in equal proportions from a centre point of origin?

The half-circle shape is used to move the hair in equal proportions from a center point of origin because it creates a balanced, symmetrical form when styling. When the stylist sections the hair in a half-circle manner, the hair moves outward and away from the center, allowing for smooth blending and a harmonious distribution of the hair lengths. This technique facilitates the creation of styles that require equal proportions on either side, maintaining a unified look.

In contrast, the other shapes—rectangle, square, and oval—each influence the movement and layering of hair differently. A rectangular shape tends to provide more linear and angular styles, while a square focuses on sharp corners and may not create the same fluid movement from the center. An oval shape can also promote a softer look but may not emphasize equal movement from a central point as effectively as the half-circle. Hence, for maintaining uniformity and proportional distribution from a center point, the half-circle shape is more suitable.