Which of the following shapes is used to direct hair equally away then towards the face?

The half-circle shape is used to direct hair equally away from then towards the face due to its symmetrical structure. This shape allows for a balanced distribution of hair that moves outward and then inward, creating a soft frame around the face. It is particularly effective for styles that require versatility in styling, allowing for both volume and movement.

While other shapes mentioned, such as the full-circle, quadrilateral, and triangular shapes, contribute to different styles and effects in hairstyling, they do not primarily serve the purpose of directing hair in the specific manner of the half-circle. The full-circle typically creates a round and uniform fullness all around the head rather than a focus on the directional flow towards the face. The quad-shape may create angles or layers but doesn't have the same tug and flow effect necessary for this particular direction change. The triangular shape tends to direct hair in a more angular fashion, creating distinct points rather than the fluidity that the half-circle provides.

Understanding these distinctions is essential for achieving desired hairstyles and providing suitable recommendations to clients based on their face shape and personal style preferences.