The one-length hairstyle is an example of the use of which type of lines?

• A. Curved
• B. Single
• C. Wavy
• D. Diagonal

Answer: (B)

A one-length hairstyle is defined by keeping all the hair the same length around the head, which creates a single, continuous line at the perimeter. That unbroken line gives the blunt, even silhouette typical of this cut. In haircutting, the line describes the path of the cut and how weight sits; a one-length cut relies on a single line to produce that smooth, uniform edge around the head.

The other line types don’t fit because curved lines follow the head’s contours and round out the shape, wavy lines introduce texture with variation in length, and diagonal lines create angles and directional changes. For a one-length look, you want that uninterrupted, straight line, hence the emphasis on a single line.