A basic haircut where the hair is cut at a 180-degree angle is the:

A haircut where the hair is cut at a 180-degree angle is known as a long-layered cut. This technique involves elevating the hair to 180 degrees from the scalp, which allows for the creation of layers that are longer in length while maintaining some volume and movement.

In a long-layered cut, hair is raised to this high angle and cut, resulting in layers that blend seamlessly into each other. This technique is particularly effective for adding texture and volume while keeping the appearance of longer hair intact. The longer layers fall gracefully over the shorter layers, producing a soft, layered look.

Understanding the characteristics of different haircutting techniques is crucial for achieving desired styles and satisfying client preferences. The other choices refer to different cutting techniques and angles that create other styles but do not align with the 180-degree angle associated with long-layered cuts.