Which of the following techniques is used to set an expanded circle?

The technique used to set an expanded circle is the inner-and-outer method. This approach is designed to create a broader shape or volume in the hairstyle, as it involves placing rollers or pins in a way that establishes both inner and outer layers of curls or waves. By manipulating the placement of curls, this method allows for a greater expansion of the hair, giving it a fuller appearance and enhancing its overall structure.

When setting an expanded circle, this technique is particularly effective because it encourages movement and dimension in the hairstyle. The inner-and-outer technique allows for different curl sizes and directions, contributing to a more dynamic and voluminous look. Therefore, understanding and mastering this technique is crucial for hairstylists aiming to achieve styles with significant volume and texture.