Which of the following curvature shapes is commonly used in hair design?

Oblongs are commonly used in hair design because they create an elongated, flowing look that can enhance the overall shape and movement of a hairstyle. This curvature allows for soft, rounded edges that can be very flattering on various face shapes. By incorporating oblong shapes, hairstylists can achieve depth and dimension in styling, ensuring that layers and textures blend seamlessly.

Using oblong shapes helps to guide the eye, giving the illusion of length and elegance, which is often desired in hair design. This curvature is particularly useful in techniques like layering, graduation, and in the creation of soft waves or curls, making it an essential element in a stylist’s toolkit.

In contrast, while circles, triangles, and squares can have their place in design concepts, they do not typically translate as effectively into hair design as oblongs do, which are more advantageous for achieving the desired aesthetic effects.