What determines the size of a pin curl?

• A. The length of the hair
• B. The number of pins used
• C. The circle's circumference
• D. The diameter of the circle formed

Answer: (D)

The size of a pin curl is determined by the diameter of the circle formed when the hair is wrapped into the curl. The wider that circle, the larger the curl will be after setting; a smaller circle yields a tighter curl. The circumference is just a measurement around the circle and doesn’t dictate the curl size on its own—what you actually control is how wide the circle you form is. The number of pins and the length of the hair don’t set the curl’s size; they influence how securely the curl is held and how much hair can be wrapped, respectively.